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EC / List no.: 234-190-3 / 616-541-6
CAS no.: 10588-01-9 / 7789-12-0
Mol. formula: Cr2H2O7.2Na
Sodium dichromate is the inorganic compound with the formula Na2Cr2O7.
Usually, however, the salt is handled as its dihydrate Na2Cr2O7·2H2O.
Virtually all chromium ore is processed via conversion to sodium dichromate and virtually all compounds and materials based on chromium are prepared from this salt.
In terms of reactivity and appearance, sodium dichromate and potassium dichromate are very similar.
The sodium salt is, however, around twenty times more soluble in water than the potassium salt (49 g/L at 0 °C) and its equivalent weight is also lower, which is often desirable
Sodium dichromate Production
Sodium dichromate is generated on a large scale from ores containing chromium(III) oxides.
The ore is fused with a base, typically sodium carbonate, at around 1000 °C in the presence of air (source of oxygen):
2Cr2O3 + 4Na2CO3 + 3O2 -> 4Na2CrO4 + 4CO2
This step solubilizes the chromium and allows it to be extracted into hot water.
At this stage, other components of the ore such as aluminium and iron compounds, are poorly soluble.
Acidification of the resulting aqueous extract with sulfuric acid or carbon dioxide affords the dichromate:
2Na2CrO4 + 2CO2 + H2O -> Na2Cr2O7 + 2NaHCO3
2Na2CrO4 + H2SO4 -> Na2Cr2O7 + Na2SO4 + H2O
The dichromate is isolated as the dihydrate by crystallization.
In this way, many millions of kilograms of sodium dichromate are produced annually.
Since chromium(VI) is toxic, especially as the dust, such factories are subject to stringent regulations.
For example, effluent from such refineries is treated with reducing agents to return any chromium(VI) to chromium(III), which is less threatening to the environment.
A variety of hydrates of this salt are known, ranging from the decahydrate below 19.5 °C (CAS# 13517-17-4 ) as well as hexa-, tetra-, and dihydrates.
Above 62 °C, these salts lose water spontaneously to give the anhydrous material.
Sodium Dichromate is crystallised around 30 to 35 degrees C
Sodium dichromate Reactions
Dichromate and chromate salts are oxidizing agents.
For the tanning of leather, sodium dichromate is first reduced with sulfur dioxide.
In the area of organic synthesis, this compound oxidizes benzylic and allylic C-H bonds to carbonyl derivatives.
For example, 2,4,6-trinitrotoluene is oxidized to the corresponding carboxylic acid.
Similarly, 2,3-dimethylnaphthalene is oxidized by Na2Cr2O7 to 2,3-naphthalenedicarboxylic acid.
Secondary alcohols are oxidized to the corresponding ketone, e.g. menthol to menthone; dihydrocholesterol to cholestanone:
3 R2CHOH + Cr2O72− + 2 H+ → 3 R2C=O + Cr2O3 + 4 H2O
Relative to the potassium salt, the main advantage of sodium dichromate is its greater solubility in water and polar solvents like acetic acid.
Sodium dichromate can be used in fluorene to fluorenone conversion.
Sodium Dichromate is an orange to red colored, crystalline, inorganic compound that emits toxic chromium fumes upon heating.
Sodium dichromate is highly corrosive and is a strong oxidizing agent.
Sodium Dichromate is mainly used to produce other chromium compounds, but is also used in drilling muds, in metal treatments, in wood preservatives, in the production of dyes and organic chemicals and as a corrosion inhibitor.
Sodium dichromate primarily affects the respiratory system causing ulcerations, shortness of breath, bronchitis, pneumonia and asthma but can also affect the gastrointestinal tract, liver, kidneys and immune system.
Sodium Dichromate is a known human carcinogen and is associated with an increased risk of developing lung cancer and cancer of the sinonasal cavity.
Sodium dichromate Pharmacology
Sodium Dichromate is an orange to red colored, crystalline, inorganic compound that emits toxic chromium fumes upon heating.
Sodium dichromate is highly corrosive and is a strong oxidizing agent.
Sodium Dichromate is mainly used to produce other chromium compounds, but is also used in drilling muds, in metal treatments, in wood preservatives, in the production of dyes and organic chemicals and as a corrosion inhibitor.
Sodium dichromate Use and Manufacturing
Sodium dichromate is the primary base material for the manufacture of chromium chemicals, which are used in leather tanning, metal treatment, drilling muds, textile dyes, catalysts, and wood and water treatment.
Oxidizing agent in manufacture of dyes, many other synthetic organic chemicals, inks, etc.; in chrome-tanning of hides; in electric batteries; bleaching fats, oils, sponges, resins; refining petroleum; manufacturing chromic acid, other chromates and chrome pigments; in corrosion-inhibitors, corrosion-inhibiting paints; in many metal treatments; electroengraving of copper; mordant in dyeing; for hardening gelatin; for the defoliation of cotton plants and other plants and shrubs ... . Preparation of titrant in redox reactions.
Sodium dichromate Industry Uses
Dyes
Intermediates
Pigments
Plating agents and surface treating agents
Processing aids, specific to petroleum production
Sodium dichromate Consumer Uses
Metal products not covered elsewhere
Paints and coatings
Plastic and rubber products not covered elsewhere
Sodium dichromate Methods of Manufacturing
Sodium chromate can be converted to the dichromate by a continuous process treating with sulfuric acid, carbon dioxide, or a combination of these two.
Evaporation of the sodium dichromate liquor causes the precipitation of sodium sulfate and/or sodium bicarbonate, and these compounds are removed before the final sodium dichromate crystallization.
Sodium dichromate is made in a three-step process: (1) alkaline roast of chromite under-oxidizing conditions, (2) leaching, and (3) conversion of sodium monochromate to sodium dichromate by means of an acid.
Anhydrous sodium dichromate can be prepared by melting down sodium dichromate dihydrate, by crystallizing aqueous dichromate solutions above 86 °C, or by drying sodium dichromate solutions in spray driers.
Industry Processing Sectors
All other basic inorganic chemical manufacturing
Electrical equipment, appliance, and component manufacturing
Fabricated metal product manufacturing
Miscellaneous manufacturing
Petrochemical manufacturing
Printing and related support activities
Synthetic dye and pigment manufacturing
Textiles, apparel, and leather manufacturing
Calcination of sodium dichromate with sulfur or carbon is used to produce anhydrous chrome oxide for chrome oxide green pigments.
Wash waters contain unreacted hexavalent chromate materials.
Hydrated chrome oxide is made by reacting sodium dichromate with boric acid, also used as green pigments.
AOven residues contain hexavalent and trivalent chromium, as do wash waters from boric acid recovery processes.
IDENTIFICATION AND USE:
Sodium dichromate is a red or red-orange crystalline solid.
Sodium Dichromate is used as oxidizing agent in the manufacture of dyes, many other synthetic organic chemicals, and inks; in chrome-tanning of hides; in electric batteries; bleaching fats, oils, sponges, resins; refining petroleum; in corrosion-inhibitors, corrosion-inhibiting paints; in many metal treatments; electroengraving of copper; mordant in dyeing; for hardening gelatin; for the defoliation of cotton plants and other plants and shrubs.
Sodium Dichromate is also used as veterinary medication.
Chemical Properties
Red or red-orange deliquescent crystals.
Decomposes at 400C, loses 2H 2 O on prolonged heating at 100C.
Soluble in water; insoluble in alcohol. Noncombustible.
Sodium chromate, including the hexahydrate, is yellow crystalline solids that can also be used in solution. Disodium Dichromate (10588-01-9):
Uses
Colorimetry (copper determination), complex- ing agent, oxidation inhibitor in ethyl ether.
Sodium dichromate is red solid, soluble, powerful oxidizing agent, and consequently a fire hazard with dry carbonaceous materials.
Formed by acidifying sodium chromate solution, and then evaporating.
Used (1) in matches and pyrotechnics, (2) in leather tanning and in the textile industry, (3) as a source of chromate, cheaper than potassium dichromate.
General Description
A red or red-orange crystalline solid.
May be strongly irritating to skin, eyes and mucous membranes.
Used as a corrosion inhibitor, and in the manufacture of other chemicals
Key Points
Disodium Dichromate also known as sodium bichromate, bichromate of soda and sodium dichromate (VI)
Disodium Dichromate is a red to orange crystalline solid
Disodium Dichromate is used as an intermediate in the production of other chromium compounds and in the
past was used in wood preservatives
general public may be exposure to very low levels of sodium dichromate as a
contaminant in air or water
toxic via inhalation, ingestion skin and dermal contact
inhalation can cause cough, chest pains, runny nose, sore throat and swelling and
irritation of the voice box (laryngitis); in severe cases lung damage can occur
ingestion can cause corrosive damage to the digestive tract causing stomach upset,
bloody diarrhoea and vomiting of blood
in severe cases sodium dichromate can cause kidney failure, liver damage, fitting and
coma; these symptoms may be delayed for up to 24 hours after the exposure
skin contact with sodium dichromate can cause skin irritation, ulceration and burns
eye exposure may cause pain, twitching of the eyelid, tearing, swelling of the eye and
sensitivity to light
sodium dichromate can cause cancer in humans
What is sodium dichromate?
Sodium dichromate is a red to orange crystalline solid.
Disodium Dichromate is a member of a chemical group
known as chromium (VI) compounds.
Other names for sodium dichromate include sodium
bichromate, bichromate of soda and sodium dichromate (VI).
What is sodium dichromate used for?
Sodium dichromate is mainly used as a chemical intermediate in the production of other
chromium compounds.
Disodium Dichromate is also used in the production of dyes, as a bleaching agent and a
corrosion inhibitor.
In the past sodium dichromate was used in wood preservatives.
How does sodium dichromate get into the environment?
Sodium dichromate may be released into the environment during its production and use.
Product information Sodium Dichromate
Sodium dichromate (VI) has the formula Na2Cr2O7., and is also known as sodium bichromate or bichromate of soda.
Sodium dichromate is an important starting material for a wide variety of other known chromium compounds (see also other chrome based chemicals).
Application areas
Sodium dichromate has various uses, the most important direct uses are:
Metal finishing/surface treatment: corrosion resistance, paint adhesion properties, supports cleaning the metal surface
Metal working auxiliary
Electroplating
Pigments: preparation of pigments and as corrosion inhibitor
ceramics: used in the production of colored glass and ceramic glazes
Catalyst for the chromium metal production
Laboratory chemical
Initial product for chemical reactions
Chemical intermediate
Surface modifiers
Surface additive
Chromium source in preparing other chromium compounds (see chrome based chemicals)
Formulation (mixing) of preparations and/or re-packaging (excluding alloys)
Manufacture of plastics products, including compounding and conversion
Industrial uses: uses of substances as such or in preparations at industrial sites
Sodium Dichromate is generally immediately available in most volumes.
Hydrate or anhydrous forms may be purchased.
High purity, submicron and nanopowder forms may be considered.
American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards.
Typical and custom packaging is available.
Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.
SODIUM DICHROMATE
These corrosion data are mainly based on results of general corrosion laboratory tests, carried out with pure chemicals and water solutions nearly saturated with air (the corrosion rate can be quite different if the solution is free from oxygen).
All concentrations are given in weight-% and the solvent is water if nothing else is shown.
The corrosion data apply to annealed materials with normal microstructure and clean surfaces, throughout.
sodium dichromate is a poisonous red deliquescent crystalline salt Na2Cr2O7 made by oxidizing sodium chromate and used in making pigments, tanning leather, dyeing, cleaning and protecting metals from corrosion, and as an oxidizing agent
Sodium dichromate or Na2Cr2O7 is an orange to red-coloured, crystalline, and inorganic compound which emits toxic chromium fumes on heating.
Sodium dichromate is highly corrosive in nature and is a strong oxidizing agent.
Sodium Dichromate is usually used to produce other chromium compounds but is also used for drilling muds, metal treatments, wood preservatives, production of dyes and organic chemicals, and as a corrosion inhibitor.
Let us first learn about what is sodium dichromate or Na2Cr2O7 .
What is Sodium Dichromate?
Sodium dichromate or Na2Cr2O7 is an inorganic compound.
Sodium Dichromate is also known as bichromate of soda, disodium dichromate, or sodium dichromate (VI).
Sodium Dichromate is known to be a powerful oxidizing agent and is highly corrosive.
Sodium dichromate is a red to reddish-orange crystalline solid.
Sodium Dichromate is odourless and dissolves in water, methanol and ethanol.
Sodium Dichromate is commonly used as a corrosion inhibitor.
On heating, Sodium Dichromate liberates chromium fumes that are toxic in nature.
Production of Sodium Dichromate
On a larger scale, sodium dichromate is obtained from ores which contain chromium (III) oxides.
Let us have a look at the Na2Cr2O7 reaction and how it is produced.
The first step is to fuse the ore with a base such as sodium carbonate.
Next, maintain a temperature around 1000 °C.
Then, conduct the above two steps in the presence of air that is the source of oxygen.
The reaction is given below:
2Cr2O3 + 4Na2CO3 + 3O2 ---> 4Na2CrO4 + 4CO2
These steps solubilize chromium and allow it to extract in the hot water.
The other components present in the ore are poorly soluble and therefore, acidification of the resulting aqueous extract by utilizing carbon dioxide or sulfuric acid helps to produce dichromate.
The reaction is as follows:
2Na2CrO4 + 4CO + H2O ---> Na2CrO7 + 2NaHCO3
2Na2CrO4 + H2SO4 ---> Na2CrO7 + Na2So4 + H2O
Using the process of crystallization, dichromate is extracted as a dihydrate.
Sodium Dichromate Uses
Apart from its importance for the production of other chromium products, sodium dichromate also has many uses as an ingredient in the production of the following materials:
Metallic Finish - it helps to prevent corrosion, making it easier to clean the metallic surfaces and allows the paint to stick.
Organic products - used as oxidisers for the production of vitamin K and wax.
Pigments - used in making inorganic chromate pigments where it produces a range of light-stable colours.
Some grades of chromate are used for the prevention of corrosion in undercoats and primers.
Ceramics - used to produce coloured glass and ceramic glaze.
Textiles - used as a mordant in the acidic dyes to improve colour-fast properties.
Used in the chromium sulphate production.
Description
Bright orange or red crystals.
Sodium dichromate is as used an oxidizing agent in dyes, inks, and paints.
Sodium Dichromate is also used for chrome tanning hides and as a chrome mordant for textile dyeing.
Solutions of sodium dichromate are used as anticorrosive agents for Iron and preservatives for wood.
In the 19th century aqueous solutions of chromic acid, prepared with sodium dichromate and Sulfuric acid, were used as glass cleaning solutions in laboratories.
Sodium Dichromate is a strong oxidising agent and a source in preparing chromium based derivatives.
Sodium Dichromate is used in metal passivation and finds applications across diverse industries including pigments and coatings, screen printing in photographic engraving, electroplating, pyrotechnics and explosives.
As a wood preservative, Sodium Dichromate protects wood from termites and fungi while in metal treatment it works as a corrosion inhibitor.
Sodium Dichromate is also used in pigment preparations like chrome oxide green and lead chromate.
Applications of Sodium Dichromate
Source in preparing chromium based derivative
Screen printing & Photographic engraving
Electroplating
Pyrotechnics and explosives
Pigment preparation like chrome oxide green, lead chromate etc.
Wood preservative for protection from termites and fungi
Metal treating and corrosion inhibitor
Oil well drilling as treating agents in drilling mud systems
Catalyst for the chromium metal production
As an oxidizing agent in organic synthesis
Tanning leather, inorganic pigments, dyestuffs/stain (staining cotton/woolen fabric and color fixing of textile printing), surface treatment of Raw material for other chromium compounds,Tanning of leather,Mordant for dyeing,Dyestuffs,Pigments,Oxidizing agent in organic syntheses,Catalysts,Metal finishing,Corrosion inhibitors.
STORAGE CONDITIONS
Store in cool and dry places
Keep away from sunlight and heat sources, combustible organic materials, volatile organic compounds, flammable solvents and other readily oxidizable material
Avoid storage on wood floors
Remove and dispose of any spilled dichromate, don’t return to original container
Protect against physical damage by handling vehicles like forklift or crane hooks, so as to prevent damage to bags
About Sodium Dichromate
Helpful information
Sodium Dichromate is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 100 to < 1 000 tonnes per annum.
Sodium Dichromate is used in articles, by professional workers (widespread uses), in formulation or re-packing, at industrial sites and in manufacturing.
Consumer Uses
ECHA has no public registered data indicating whether or in which chemical products the substance might be used. ECHA has no public registered data on the routes by which Sodium Dichromate is most likely to be released to the environment.
Article service life
Release to the environment of Sodium Dichromate can occur from industrial use: manufacturing of the substance, as an intermediate step in further manufacturing of another substance (use of intermediates), formulation of mixtures and in processing aids at industrial sites. Other release to the environment of Sodium Dichromate is likely to occur from: outdoor use in long-life materials with low release rate (e.g. metal, wooden and plastic construction and building materials) and indoor use in long-life materials with low release rate (e.g. flooring, furniture, toys, construction materials, curtains, foot-wear, leather products, paper and cardboard products, electronic equipment). Sodium Dichromate can be found in complex articles, with no release intended: vehicles. Sodium Dichromate can be found in products with material based on: fabrics, textiles and apparel (e.g. clothing, mattress, curtains or carpets, textile toys) and metal (e.g. cutlery, pots, toys, jewellery).
Widespread uses by professional workers
Sodium Dichromate is used in the following products: laboratory chemicals.
Sodium Dichromate has an industrial use resulting in manufacture of another substance (use of intermediates).
Sodium Dichromate is used in the following areas: scientific research and development.
Release to the environment of Sodium Dichromate can occur from industrial use: formulation of mixtures, as an intermediate step in further manufacturing of another substance (use of intermediates) and as processing aid.
Other release to the environment of Sodium Dichromate is likely to occur from: indoor use as reactive substance.
Formulation or re-packing
Sodium Dichromate is used in the following products: metal surface treatment products, laboratory chemicals, metals, coating products, fillers, putties, plasters, modelling clay, non-metal-surface treatment products, pH regulators and water treatment products, textile treatment products and dyes and cosmetics and personal care products.
Sodium Dichromate has an industrial use resulting in manufacture of another substance (use of intermediates).
Release to the environment of Sodium Dichromate can occur from industrial use: formulation of mixtures, manufacturing of the substance and as an intermediate step in further manufacturing of another substance (use of intermediates).
Uses at industrial sites
Sodium Dichromate is used in the following products: metal surface treatment products, leather treatment products, non-metal-surface treatment products, pharmaceuticals and textile treatment products and dyes.
Sodium Dichromate has an industrial use resulting in manufacture of another substance (use of intermediates).
Sodium Dichromate is used in the following areas: formulation of mixtures and/or re-packaging and scientific research and development.
Sodium Dichromate is used for the manufacture of: chemicals, fabricated metal products and plastic products.
Release to the environment of Sodium Dichromate can occur from industrial use: as an intermediate step in further manufacturing of another substance (use of intermediates), as processing aid, in the production of articles, manufacturing of the substance, formulation of mixtures, of substances in closed systems with minimal release and in processing aids at industrial sites.
Other release to the environment of Sodium Dichromate is likely to occur from: outdoor use in long-life materials with low release rate (e.g. metal, wooden and plastic construction and building materials) and indoor use in long-life materials with low release rate (e.g. flooring, furniture, toys, construction materials, curtains, foot-wear, leather products, paper and cardboard products, electronic equipment).
Manufacture
Release to the environment of Sodium Dichromate can occur from industrial use: manufacturing of the substance, as an intermediate step in further manufacturing of another substance (use of intermediates), formulation of mixtures, in processing aids at industrial sites, as processing aid and of substances in closed systems with minimal release.
Sodium dichromate description : Sodium dichromate comes as orange to red powder, hygroscopic product with a purity of 98.9% minimum.
Uses : main uses for sodium dichromate are surface treatment and leather tanning.
Sodium dichromate is also used as a strong oxidant in organic chemistry, as a corrosion inhibitor, in inks, dyes and pigments.
In surface treatment, sodium dichromate is used for passivation on stainless steel, steel and aluminum in acid baths.
Packaging : 25kg bags (other types of packaging available upon request)
Availability : on stock
Storage : store in a cool, dry, well-ventilated place.
Keep the Sodium dichromate in its original packaging, tightly closed.
Avoid contact with acids.
A red crystalline solid, Na2Cr2O7.2H2O, soluble in water and insoluble in ethanol.
Sodium Dichromate is usually known as the dihydrate (r.d. 2.52), which starts to lose water above 100°C; the compound decomposes above 400°C.
Sodium Dichromate is made by melting chrome iron ore with lime and soda ash and acidification of the chromate thus formed.
Sodium dichromate is cheaper than the corresponding potassium compound but has the disadvantage of being hygroscopic.
Sodium Dichromate is used as a mordant in dyeing, as an oxidizing agent in organic chemistry, and in analytical chemistry.
Sodium dichromate is used as a strong oxidizing agent in organic synthesis.
Sodium Dichromate is used in metal finishing as an aid of corrosion resistance, manufacture of inorganic chromate pigments and in the preparation of colored glass and ceramic glazes.
Sodium Dichromate is used as a mordant for acidic dyes to improve their color-fast properties and as a corrosion inhibitor in undercoats and primers
SODIUM DICHROMATE is used in textile dyes, used in water treatment, used in leather tanning, used as a catalyst, as an oxidising agent in the manufacturing of synthetic organic chemicals, used in the refining of petroleum, used in metal treatments such as electro-engraving of copper, used in Colorimetry experiment to determine the amount to copper, used as an insecticide and fungicide, used as a colourant in glass.
Sodium Dichromate dihydrate is a odourless orange crystalline product that dissolves readily in water.
Sodium Dichromate is hygroscopic material and readily absorbs moisture from the atmosphere.
Sodium Dichromate offered is also nown by the chemical name of sodium bichromate; Bichromate of soda; Disodium dichromate; Sodium dichromate(VI) and others.
Sodium Dichromate has molecular formula of Cr2Na2O7 and molecular weight of 261.967539 g/mol.
Made available as crystalline orange to red colored inorganic compound, it emits toxic chromium fumes upon heating and is highly corrosive and strong oxidizing agent.
Sodium Dichromate is used for producing other chromium compounds as well as for drilling muds, in wood preservatives, in metal treatments, in production of dyes and organic chemicals.
Template: Chembox new Sodium dichromate is the chemical compound with the formula Na2Cr2O7. Usually, however, the salt is handled as its dihydrate Na2Cr2O7·2H2O.
Its chemistry, appearance, and behaviour are very similar to those of the more widely encountered potassium dichromate.
This chemical is around twenty times more soluble in water than the potassium salt (49 g/L at 0 °C) and its equivalent weight is also lower, which is often desirable.
Applications in organic chemistry
This compound oxidizes benzylic and allylic C-H bonds to carbonyl derivatives.
For example, 2,4,6-trinitrotoluene is oxidized to the corresponding carboxylic acid.
Similarly, 2,3-dimethylnaphthalene is oxidized by Na2Cr2O7 to 2,3-naphthalenedicarboxylic acid (m.p. 239–241 °C).
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Product description Sodium dichromate
Sodium dichromate (anhydrous) is also known by Sodium bichromate and has the formula Na2Cr2O7.
Product information
Sodium dichromate (VI) is a fine, bright red crystalline.
As a result of its oxidizing properties, sodium dichromate can be used, among others, in metal surface treatment, in production of chromate pigments and textile treatment.
Sodium dichromate is a chemical compound of sodium and hexavalent chromium.
Sodium Dichromate is produced during the processing of chromium ore and may be used in organic synthesis.
Hexavalent chromium refers to chemical compounds that contain the element chromium in the +6 oxidation state.
Chromium(VI) is more toxic than other oxidation states of the chromium atom because of its greater ability to enter cells and higher redox potential.
Compound Type
Chromium Compound
Industrial/Workplace Toxin
Inorganic Compound
Pollutant
Synthetic Compound
belongs to the class of inorganic compounds known as miscellaneous chromates.
These are inorganic compounds in which the largest metallic oxoanion is chromate, to which either no atom or a non metal atom is bonded.
Sodium Dichromate is used in the following products:
metal surface treatment products
leather treatment products
non-metal-surface treatment products
pharmaceuticals
textile treatment products and dyes
Sodium dichromate is also commonly referred to as sodium bichromate or sodium bichromate dihydrate and is known technically as sodium dichromate dihydrate.
The chemical formula for the compound is Na2Cr2O7 2H2O.3 In crystalline form, the chemical is bright orange and has a molecular weight of 298 grams/mol (g/mol).
Sodium Dichromate is highly soluble in water. The chemical is sold in both solution and crystalline forms.
Used in water treatment, dye and electric battery manufacturing, bleaching (fats, oils, sponges, and resins), refining petroleum, corrosion inhibitors (paints, metal coatings, and water systems), metal treatments, electroengraving of copper, defoliation of cotton and other plants and shrubs, fungicides, insecticides, miticides, wood preservation, glass colorants, dye mordants, and breweries (algaecide); [HSDB] Used in colorimetry (copper determination), as a complexing agent, and as an oxidation inhibitor in ethyl ether; Used to make vitamin K and waxes; Compared with sodium dichromate dihydrate, it has the advantage of first absorbing 2 molecules of water instead of deliquescing immediately.
Sodium Dichromate Dihydrate is used as a catalyst in the synthesis of Endoperoxide II.
Strong oxidizing agent in organic synthesis. Used in metal finishing as an aid in corrosion resistance.
Molecular Formula: Cr₂Na₂O₇•2(H₂O)
Appearance: Orange Solid
Melting Point: >90°C (dec.)
Molecular Weight: 261.97+2(18.02)
Storage: Room Temperature
Solubility: Methanol (Slightly, Sonicated)
Category: Building Blocks; Catalyst;
Sodium dichromate is used as a salt to produce all majority compounds and materials based on chromium. Sodium Dichromate is used for manufacturing potassium dichromate and acetic anhydride.
The applications of sodium dichromate have increased in the metal finishing industry because it prevents metal surface corrosion.
Sodium Dichromate is widely used in wood preservatives, manufacturing of pigments, and leather tanning.
Sodium dichromate finds application in mud drilling, paints, and coatings, textile dyeing, vitamin K, and wax.
Sodium Dichromate is increasingly used as a mordant in dyeing due to its color-fastening property.
Sodium Dichromate is also used to manufacture colored glasses and ceramic glazes.
Sodium Dichromate is a bright orange inorganic chromium salt that is very similar to potassium dichromate in its appearance.
Its chemical formula is Na2Cr2O7, but is used in its dihydrate form Na2Cr2O7.2H2O.
The compound is around 20 times more water-soluble than potassium dichromate, it also has a relatively low equivalent weight.
The production of almost all chromium ores and chromate based compounds is through this salt.
Structure and Formula
The bonding of this inorganic chromium salt is similar to that of potassium dichromate, as the anion is the same in both the compounds and the only cation is different, so it has an ionic bond between two Na+1 and one Cr2O72-.
Dichromate ion is sp3 hybridised and has a tetrahedral structure.
Molar Mass: 261.97 g/mol
Appearance: Bright orange crystalline solid
Density: 2.52 g/cm3
Melting Point: 356.7°C (Polymorphic Transformation)
Boiling Point: 400°C, Starts decomposing from 1360°C
Solubility: Soluble in water, Methanol and Ethanol
Odour: Odourless
Refractive Index: 1.661 (Dihydrate)
Chemical Properties
Oxidation:
In organic synthesis, the compound is used to convert benzylic and allylic C-H bonds into carbonyl derivatives like aldehydes, ketones or carboxylic acids.
3R2CHOH + Cr2O72- + 2H+ -> 3R2C=O + Cr2O3 + 4H2O
Sodium Dichromate is used in the conversion of fluorene to fluorenone.
Applications of Sodium Dichromate
The compound is used in the production of many other chromium products.
But it is also used in the production of chromium sulfate.
Sodium Dichromate is used in the tanning of leather.
Sodium Dichromate is used to prevent the corrosion of metallic surfaces and also lets paint stick to them.
Used in the production of wax and vitamin K, as an oxidiser.
Also used in colour glass production and also in ceramic glaze.
Sodium dichromate is the chemical compound with the formula Na2Cr2O7.
Usually, however, the salt is handled as its dihydrate Na2Cr2O7•2H2O.
Virtually all chromium ore is processed via conversion to sodium dichromate.
In this way, many millions of kilograms of sodium dichromate are produced annually.
In terms of reactivity and appearance, sodium dichromate and potassium dichromate are very similar.
The sodium salt is, however, around twenty times more soluble in water than the potassium salt (49 g/L at 0 °C) and its equivalent weight is also lower, which is often desirable.
Sodium dichromate is generated on a large scale from ores containing chromium oxides.
The ore is fused with a base, typically sodium carbonate, at around 1000 °C in the presence of air (source of oxygen).
This step solubilizes the chromium and allows it to be extracted into hot water.
At this stage, other components of the ore such as aluminium and iron compounds, are poorly soluble. Acidification of the resulting aqueous extract with sulfuric acid or carbon dioxide affords the dichromate, which is isolated at the dihydrate by crystallization.
Since chromium is toxic, especially as the dust, such factories are subject to stringent regulations.
For example, effluent from such refineries is treated with reducing agents to return any chromium to chromium, which is less threatening to the environment.
Sodium dichromate comprises red or red-orange deliquescent crystals, Sodium Dichromate is soluble in water and insoluble in alcohol.
Application
Dichromates are power oxidizing agents which find applications in: Chromium source in preparing chromium compounds, Leather tanning and screen printing, Electroplating ,Pyrotechnics and explosives, Pigment preparation, Wood Preservative , Metal Treating and corrosion inhibitor, Oil drilling ,Catalyst for the chromium metal production ,Photographic engraving.
In the pigment industry, sodium dichromate is used to manufacture lead chromate compounds which are then used in manufacturing paints, printing inks, paper coloring, and floor coverings.
In oil well drilling muds, sodium dichromate is used to create soluble chromates for corrosion control and chrome lignosulfates for deflocculation and thinning agents which help control drilling mud viscosity.
Sodium dichromate is also used in the manufacture of photographic films, flavours, essential oils, saccharin, pharmaceuticals,9 pyrotechnics, explosives, safety matches, chrome glues and adhesives, wood stains, poison fly paper, process engraving and lithography, synthetic perfumes, chrome alum manufacture, alloys, ceramic products, depolarizers in dry cell batteries, bleaching fats and waxes.
Consumption of chromium chemicals has been in decline since peaking at 163 thousand tons in 1974.
This is primarily due to environmental and health concerns.
The trend has apparently now ceased and the current consumption level represents difficult-to-substitute applications of chrome chemicals.
Over the next four years, U.S. sodium bichromate consumption is anticipated to grow modestly, at 0.5 percent annually.
Shipment / Storage
Sodium dichromate is shipped in multi-ply paper bags or fibre drums.
When exposed to the air over an extended period will become a semi-solid pliable mass and change colour to brilliant red.
Will liquefy when exposed to heat.
Only handle with suitable protective clothing.
Sodium Dichromate is a toxic material.
Boiling point: 400° C
Melting point: 357° C
Product Details
Application:
Sodium dichromate is an oxidizing agent and has multiple industrial uses.
Sodium dichromate is used in pigment manufacturing, metal treating, and oil-well drilling.
Other sodium dichromate applications include use in many organic syntheses, preparation of colored glasses and glazes, and preparation of other chromium compounds.
Compatibility:
Sodium dichromate is not compatible with acids, alkalis, reducing agents, combustible materials, and organic materials.
Packaging Options:
Sodium dichromate is available in 55 pound bags.
Please contact us for specific packaging information.
Na2Cr2O7 is an inorganic compound with chemical name Sodium dichromate.
Sodium Dichromate is also called Bichromate of soda or Disodium dichromate or Sodium dichromate (VI).
Sodium Dichromate is a powerful oxidizing agent and highly corrosive.
Bichromate of soda is a red to red-orange crystalline solid.
Sodium Dichromate is odourless and dissolves in water, methanol as well as ethanol.
Sodium Dichromate is widely used as a corrosion inhibitor.
On heating it liberates toxic chromium fumes.
Na2Cr2O7 Uses (Sodium dichromate)
Sodium dichromate is a primary material in the manufacturing of chromium chemicals.
Sodium Dichromate Used as textile dyes.
Sodium Dichromate Used in water treatment.
Sodium Dichromate Used in leather tanning.
Sodium Dichromate Used as a catalyst.
Sodium Dichromate Used as an oxidising agent in the manufacturing of synthetic organic chemicals.
Sodium Dichromate Used in the refining of petroleum.
Sodium Dichromate Used in metal treatments such as electro-engraving of copper.
Sodium Dichromate Used in Colorimetry experiment to determine the amount to copper.
Sodium Dichromate Used as an insecticide and fungicide.
Sodium Dichromate Used as a colourant in glass.
IUPAC NAMES:
Chromic acid (H2Cr2O7), disodium salt
dichromate de sodium
disodium [(oxidodioxochromio)oxy]chromiumoylolate
disodium [(oxidodioxochromio)oxy]chromiumoylolate dihydrate
disodium oxido-(oxido(dioxo)chromio)oxy-dioxochromium
disodium oxido-(oxido-dioxo-chromio)oxy-dioxo-chromium hydrate
Sodio Dicromato 2-hidrato
Sodium Bichromate
sodium chromate
Sodium Dichromate
Sodium dichromate
sodium dichromate
Sodium Dichromate
Sodium dichromate
sodium dichromate
sodium dichromate dihydrate
sodium dichromate dihydrate
sodium dichromate(VI)
SYNONYMS
Sodium dichromate
10588-01-9
Bichromate of soda
Disodium dichromate
Natriumdichromat
Sodium dichromate(VI)
UNII-C9G6VY6ZZ4
Dichromic acid, disodium salt
C9G6VY6ZZ4
Celcure
Chromic acid (H2Cr2O7), sodium salt (1:2)
Caswell No. 761
Celcure Wood Presrvative
Natriumbichromaat
Natriumdichromaat
Natriumbichromaat [Dutch]
Natriumdichromaat [Dutch]
Natriumdichromat [German]
Koppers Wolman Salts CCA
Wolman Salts CCA-Type B
Wolman Salts CCA-Type C
Dichromate, sodium
Oakite Composition No. 155
Bichromate de sodium
Bichromate de sodium [French]
Wood Cure A Wood Preservative
HSDB 737
Osmose Hollow Heart Concentrate
Sodium(dichromate de)
Sodium(dichromate de) [French]
Sodio (dicromato di)
Sodio (dicromato di) [Italian]
Sodium dichromate (Na2(Cr2O7))
Na2Cr2O7
Chromium sodium oxide (Cr3Na2O7)
EINECS 234-190-3
Sodium dichromate solution
EPA Pesticide Chemical Code 068304
Dichromic acid, sodium salt
Chromic acid (H2Cr2O7), disodium salt
Dichromic acid (H2Cr2O7), disodium salt
CCRIS 8137
J. H. Baxter Chromated Zinc Chloride Solution
EINECS 252-062-5
Natriumdichromat(VI)
sodium dichromate(2-)
Sodium dichromate solution (70% or less)
Cr2O7.2Na
Na2[Cr2O7]
Sodium dichromate [Chromium and chromium compounds]
DTXSID8021274
CHEBI:39483
DICHROMIC ACID,SODIUM SALT
8506AF
AKOS015913934
34493-01-1
Q407873
disodium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium
