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Chemical Formula: Na2WO4
CAS: 13472-45-2
European Community (EC) Number: 236-743-4
Molecular Weight: 293.82
MDL No: MFCD00003505
DEFINATION OF SODIUM TUNGSTATE
ChEBI: An inorganic sodium salt having tungstate as the counterion. Combines with hydrogen peroxide for the oxidation of secondary amines to nitrones.
Sodium Tungstate is the inorganic compound with the formula Na2WO4.
This white, water-soluble solid is the sodium salt of tungstic acid.
Sodium Tungstate(VI) is useful as a source of tungsten for chemical synthesis.
Sodium Tungstate(VI) is an intermediate in the conversion of tungsten ores to the metal.
Especially : the normal salt Na2WO4 that commonly crystallizes with two molecules of water, is usually obtained during the extraction of tungsten from SODIUM TUNGSTATEs ores, and is used chiefly in making other tungsten compounds and in fireproofing textiles.
Sodium Tungstate Solution is a 38% aqueous solution represented by the formula Na2WO4.
Sodium Tungstate is used as a source of soluble tungsten for corrosion and fire inhibition, catalysts, ceramics, and light-fast colors and inks
Sodium Tungstate is a tungstate of sodium, chemical formula is Na2WO4•2H2O which is prepared from tungsten ores used to manufacture tungsten by reducing.
Sodium Wolframate is mainly used as production of tungsten oxides.
Sodium Tungstate is also used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones.
Sodium Wolframate is also used for treatment of diabetes in animal, in the dye and textile industry,intermediate in preparation of tungsten compounds, fire proofing fabrics & cellulose, alkaloid precipitant.
Sodium Tungstate is an inorganic material having the chemical formula Na2WO4.
Tungstic Acid is manufactured via treatment of tungsten ores with sodium compounds such as sodium hydroxide or sodium carbonate.
Tungstic Acid is a white colored solid with water-soluble nature and crystalline form.
In addition, Sodium Tungstate is utilized in examination of serum protein & serum protein-free filtrate; as alkaloid precipitating agent; and in manufacture of metal tungsten, tungstate, tungsten oxide, waterproof fabric, & fireproof fabric.
Computed Properties
Melting point: 3410 °C(lit.)
Boiling point: 5660 °C(lit.)
Density: 2.3 g/mL at 25 °C(lit.)
Solubility H2O: soluble
Form: Wire
Water Solubility: g/100g H2O: 71.5 (0°C), 73.0 (20°C), 97.2 (100°C) [LAN05]
Merck: 13,8772
Physical and Chemical Properties: Colorless crystals or white orthorhombic crystals.
Uses of SODIUM TUNGSTATE
The dominant use of sodium tungstate is as an intermediate in the extraction of tungsten from SODIUM TUNGSTATEs ores, almost all of which are tungstates.
Otherwise sodium tungstate has only niche applications.
In organic chemistry, sodium tungstate is used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones.
Tungstic Acid exhibits anti-diabetic effects.
Solutions of sodium and lithium metatungstates are used in density separation.
Such solutions are less toxic than bromoform and methylene iodide, but still have densities that fall between a number of naturally coupled minerals.
Sodium tungstate is a competitive inhibitor of molybdenum.
Dietary tungsten reduces the concentration of molybdenum in tissues.
A substance used in a chemical reaction to detect, measure, examine, or produce other substances.
In organic chemistry, sodium tungstate is used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones.
Used in examining the serum protein, serum protein-free filtrate.
Used as alkaloid precipitating agent.
Used in manufacture of metal tungsten, tungstate and tungsten oxide.
Waterproof and fireproof fabric.
Intermediate in preparation of tungsten com- pounds, (e.g., phosphotungstate), reagent, fire- proofing fabrics and cellulose, alkaloid precipitant.
Sodium Tungstate is an inorganic compound that is applicable in multiple fields such as chemical industries, medical, metal industries, glass industry, and textile industry and many others.
In medicinal field, SODIUM TUNGSTATE is applied for treating as an anti-diabetic and anti-obesity agent.
When administered orally sodium tungstate acts as an effective antidiabetic agent.
Sodium tungstate have dual effects of on adipocyte biology i.e. stimulation of cellular oxygen consumption and inhibition of adipogenesis.
Sodium Tungstate are used in manufacturing various types of heteropoly acid color lakes that are used in printing inks, plants, waxes, glasses, and textiles.
Sodium tungstate is widely used as a source of tungsten in chemical synthesis and intermediate for tungsten ore extraction.
Tungstic Acid is also used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones.
Mordant basic dyes, Metal surface treatment, Sub-metal for ceramics
Used in the manufacture of metal tungsten, tungstic acid, tungstate, dyes, inks, catalysts, etc
S 2477a (OTTO) Sodium tungstate solution 10%w/v - used in the oxidation of maleic acid.
Sodium Tungstate is a kind of anodic passivation film corrosion inhibitor, and SODIUM TUNGSTATEs corrosion inhibition performance is better than that of molybdenum system and phosphorus system.
Tungstic Acid, disodium salt has good corrosion inhibition effect on halogen steel, copper, copper alloy, aluminum and zinc.
When sodium tungstate is a single corrosion inhibitor, the dosage is large, about WO ~- 200mg/L or more, and the cost is high.
Color/Form: WHITE, RHOMBIC
Melting Point: 698 °C
Solubility: Colorless crystals or white crystalline powder; loses SODIUM TUNGSTATEs water @ 100 °C; aq soln is slightly alkaline, pH 8-9; effloresces in dry air; sol in about 1.1 parts water; insol in alc /Dihydrate/
Density: 4.179
Decomposition: When heated to decomposition Sodium Tungstate emits toxic fumes of /sodium oxide/.
Other Experimental Properties: White orthorhombic crystals; molecular weight: 329.85; MP: decomposes at 100 °C; density: 3.25; very sol in water, insol in ethanol /Dihydrate/
SPECIFICATIONS
WO3: Min 69.0%
Cl: Max 0.02%
SO4: Max 0.05%
Mo: Max 0.01%
Fe: Max 0.002%
pH: Max 8~10 (5%SOLUTION)
Melting point .................................. 692°C
Loses 2H2O .................................. ~100 °C
pH Value (100 g/L, H2O, 20 °C) .... 9 -11.5
Solubility in Water (@ 20°C) .......... ~ 730 g/L
Specific Gravity .............................. 3.245
Free Alkali (as Na2CO3) ................ ≤ 0.2%
Chloride (Cl) ................................... ≤ 0.05%
Sulphate (SO4) .............................. ≤ 0.02%
Total nitrogen (N) ........................... ≤ 0.005%
Iron (Fe) ......................................... ≤ 0.002%
Registry Numbers Types Sources
11343345 Reaxys Registry Number Reaxys
13472-45-2 CAS Registry Number ChemIDplus
Sodium tungstate is white flaky crystal or crystalline powder with shiny, soluble in water, insoluble in ethanol, slightly soluble in ammonia; Tungstic Acid can chemically react with a strong acid, such as hydrochloric acid, nitric acid, and alkali metal salts.
Sodium Tungstate Indicator Measuring Iron Content
In the process of detecting total iron, sodium tungstate can be the indicator.
The steps are as follows: iron sample melted with alkali at high temperature and leached with acid; heating the leachate to near boiling and adding stannous chloride solution until the solution turns to pale yellow, cooling down; add indicator of sodium tungstate and titanium trichloride to turn out tungsten blue; add a few drops of copper solution, shaking to fade tungsten blue.
Chemical Reaction of Sodium Tungstate and Sodium Sulfide
Sodium tungstate reacts with tungsten sulfide to generate sulfide SODIUM TUNGSTATE, invention has pointed out SODIUM TUNGSTATEs application in the preparation process of lubricant additive.
The tungsten trioxide, molybdenum trioxide and water, sodium hydroxide as raw materials, the reaction will get sodium tungstate, then add sodium sulfide to obtain sulfide sodium tungstate, add catalyst , nitrogen gas, base oil of lubricating oil to finally obtain lubricant additive.
Chemical Reaction of Sodium Tungstate and Sulfuric Acid
Add sulfuric acid into sodium tungstate will precipitate tungstic acid, and the chemical equation is: Na2WO4+H2SO4+=Na2SO4+H2WO4
sodium tungstate pictureyellow tungstic acid image
Chemical Reaction of Sodium Tungstate and Lead Nitrate
Sodium tungstate and lead nitrate will carry out a chemical reaction to generate lead tungstate (PWO) and sodium nitrate, which is the primary method for preparing PWO, the equation is:Na2WO4+Pb(NO3)2→PbWO4+ 2NaNO3
PWO is an important inorganic scintillator material, because of SODIUM TUNGSTATEs excellent scintillation performance, short decay time, high hardness of radiation, high density and low cost and other advantages; SODIUM TUNGSTATE has a very wide range of applications in photocatalysis, microwave, scintillator, light, optical fiber, detector and many other areas.
Chemical Reaction of Nitric Acid and Sodium Tungstate
Sodium tungstate reacts with nitric acid to get tungstic acid and sodium nitrate, following is the equation: Na2WO4+2HNO3→H2WO4+2NaNO3.
Research indicates that an aqueous solution of inorganic acid and alkali metal tungstate can obtain tungstic acid.
Chemical Reaction of Sodium Tungstate and Hydrochloric Acid
Hydrochloric acid is the most suitable inorganic acid for reaction with sodium tungstate to prepare tungstic acid, and the equation is: Na2WO4+2HCl→H2WO4+2NaCl
Tungstic acid is amorphous yellow powder with almost insoluble in an aqueous acidic solution, but the new can form colloidal solution in the water treatment process.
Chemical Reaction of Sodium Tungstate and Ammonium Chloride
Sodium tungstate and ammonium chloride in an acidic aqueous solution heated evaporative crystallization to produce sodium ammonium double salt, the process belongs to the production of tungsten powder, the reaction equation is:
10Na2WO4+6NH4Cl+12HCl+9H2O＝3(NH4)2O·Na2O·10WO3·15H2O+18NaCl
Sodium ammonium double salt will directly convert into "blue tungsten class" in hydrogen atmosphere, or calcined to "yellow tungsten", then carried out hydrogen reduction, washed with water to remove sodium tungstate to obtain tungsten powder.
Chemical Reaction of Sodium Tungstate and Hydrochloric Acid and Zinc
Sodium tungstate will react with hydrochloric acid and zinc, zinc will reduce hexavalent tungsten to tetravalent, to generate tungsten dioxide, and the reaction equation is:
Na2WO4+4HCl+Zn=WO2+2NaCl+ZnCl2+2H2O
Preparation and structure
Sodium tungstate is obtained by digestion of tungsten ores, the economically important representatives of which are tungstates, in base.
Illustrative is the extraction of sodium tungstate from wolframite:
Fe/MnWO4 + 2 NaOH + 2 H2O → Na2WO4•2H2O + Fe/Mn(OH)2
Scheelite is treated similarly using sodium carbonate.
Sodium tungstate can also be produced by treating tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved.
Several polymorphs of sodium tungstate are known, three at only one atmosphere pressure. They feature tetrahedral orthotungstate dianions but differ in the packing motif.
The WO42− anion adopts a structure like sulfate (SO42−).
Reactions
Treatment of sodium tungstate with hydrochloric acid gives the tungsten trioxide or SODIUM TUNGSTATEs acidic hydrates:
Density
4.18 gram per cubic centimetre
Na2WO4 + 2 HCl → WO3 + 2 NaCl + H2O
Na2WO4 + 2 HCl → WO3.H2O + 2 NaCl
This reaction can be reversed using aqueous sodium hydroxide.
Identifiers
InChI: 1S/2Na.4O.W/q2*+1;;;2*-1;
InChIKey: XMVONEAAOPAGAO-UHFFFAOYSA-N
CAS Registry Number: 13472-45-2
ChemSpider ID: 24266
PubChem CID: 26052
Reaxys registry number: 11343345
ChEBI ID: 63940
mapping relation type: exact match
RTECS number: YO7875000
ZVG number: 126583
HSDB ID: 5057
DSSTox substance ID: DTXSID4021420
DSSTOX compound identifier: DTXCID501420
EC number: 236-743-4
ECHA InfoCard ID: 100.033.389
AICS Chemical ID (former scheme): 13581
UNII: 64LRH4405G
Freebase ID: /m/086fc9
Microsoft Academic ID: 2780927105
Römpp online ID: RD-14-00509
OpenAlex ID: C2780927105
EINECS: 236-743-4
UNII: 64LRH4405G
DSSTox Substance ID: DTXSID4021420
IUPAC Name: disodium;dioxido(dioxo)tungsten
Canonical SMILES: [O-][W](=O)(=O)[O-].[Na+].[Na+]
Raw materials
Hydrochloric acid Sodium hydroxide
Preparation Products
Pigment Fast Reddish Blue Toner R Pigment Red 81 Tungsten trioxide Pigment Fast Light Red Lake Pigment Fast Rose Toner Pigment Violet 3 Pigment Fast Reddish Blue Lake BO TUNGSTEN SULFIDE
Depositor-Supplied Synonyms
SODIUM TUNGSTATE
13472-45-2
Disodium tungstate
SODIUM WOLFRAMATE
SODIUM TUNGSTATE(VI)
disodium dioxido(dioxo)tungsten
Sodium tungsten oxide (Na2WO4)
TUNGSTIC ACID, DISODIUM SALT
UNII-64LRH4405G
disodium;dioxido(dioxo)tungsten
Tungstate (WO42-), disodium, (T-4)-
64LRH4405G
Disodium wolframate
Tungstate, sodium
Sodium tungstate (Na2WO4)
Disodium tungstate (Na2WO4)
Tungstic acid (H2WO4), disodium salt
CCRIS 5814
Sodium tungstate (Na2(WO4))
Disodium tetraoxatungstate (2-)
Disodium tetraoxotungstate (2-)
HSDB 5057
Sodium tungstate(VI) (Na2WO4)
EINECS 236-743-4
Sodiumtungstate(VI)
sodium tungstate (VI)
Na2O4W
Na2WO4
Disodium tetraoxotungstate
Tungstate (WO42-), disodium, (beta-4)-
EC 236-743-4
sodium tetraoxotungstate(VI)
Sodium Tungstate 38% Solution
Sodium tungstate, reagent grade
DTXSID4021420
CHEBI:63940
AKOS030227979
GS-3112
I977
Q418410
tungsten(4+) ion disodium dihydroxide dioxidandiide
Tungastate (WO4(2-)), disodium, (T-4)- (9CI)
