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TUNGSTIC ACID
CAS NO.: 7783-03-1
EC/LIST NO.: 231-975-2
Tungstic acid refers to hydrated forms of tungsten trioxide, WO3.
Both a monohydrate (WO3·H2O) and hemihydrate (WO3·1/2 H2O) are known.
Molecular species akin to sulfuric acid, i.e. (HO)2WO2 are not observed.
The solid-state structure of WO3·H2O consists of layers of octahedrally coordinated WO5(H2O) units where 4 vertices are shared.
The dihydrate has the same layer structure with the extra H2O molecule intercalated.
The monohydrate is a yellow solid and insoluble in water.
The classical name for this acid is 'acid of wolfram'.
Salts of tungstic acid are tungstates.
Tungstic acid was discovered by Carl Wilhelm Scheele in 1781
The formula is mWO3·nH2O.
There are various known tungstic acids, which are polyorganic compounds in which tungsten trioxide WO3 is combined with each other and combined with water in different ratios and in different forms.
The tungstic acid powder is yellow, the color is uniform, and the product has no visible inclusions.
Tungstic Acid is generally immediately available in most volumes.
Ultra high purity, 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.
Tungstic acid refers to hydrated forms of tungsten trioxide, WO3.
Both a monohydrate (WO3·H2O) and hemihydrate (WO3·0.5H2O) are known.
The solid-state structure of WO3·H2O consists of layers of octahedrally coordinated WO5(H2O) units where 4 vertices are shared.
The dihydrate has the same layer structure with the extra H2O molecule.
The monohydrate is a yellow solid and insoluble in water.
The classical name for this acid is ‘acid of wolfram’.
Salts of tungstic acid are tungstates.
Tungstic acid is obtained by the action of strong acids on solutions of alkali metallic tungstates.
Tungstic acid may also be prepared from the reaction between hydrogen carbonate and sodium tungstate.
Tungstic acid can also be obtained from pure tungsten by reaction with hydrogen peroxide.
Yellow amorphous powder; density 5.59 g/cm3; decomposes at 100°C; insoluble in water and most acids; soluble in hydrofluoric acid, caustic alkalies and ammonia solution.
Freshly prepared tungstic acid containing a molecule of water of crystallization is moderately soluble in water.
Tungstic acid was discovered by Carl Wilhelm Scheele which is an oxyacid of tungsten which is formed by neutralising the alkaline solutions of tungstate.
Tungstic acid is also known as wolframic acid, tungstic(VI) acid, dihydrogen tungstate and orthotungstic acid.
The property value of hydrogen bond donor and hydrogen bond acceptor are 2 and 4 respectively.
Tungstic acid can be obtained by reacting hydrogen carbonate and sodium tungstate.
The other way preparing is by using pure tungsten by reacting it with hydrogen peroxide.
tungstic acid, also known as [wo2(OH)2] or H2WO4, belongs to the class of inorganic compounds known as miscellaneous tungstates.
These are inorganic compounds in which the largest metallic oxoanion is tungstate, to which either no atom or a non metal atom is bonded.
Based on a literature review a significant number of articles have been published on tungstic acid.
This compound has been identified in human blood as reported by (PMID: 31557052 ).
Tungstic acid is not a naturally occurring metabolite and is only found in those individuals exposed to this compound or its derivatives.
Technically Tungstic acid is part of the human exposome.
The exposome can be defined as the collection of all the exposures of an individual in a lifetime and how those exposures relate to health.
An individual's exposure begins before birth and includes insults from environmental and occupational sources.
Tungstic acid refers to hydrated forms of tungsten trioxide, WO3.
Both a monohydrate (WO3·H2O) and hemihydrate (WO3·1/2 H2O) are known.
Molecular species akin to sulfuric acid, i.e. (HO)2WO2 are not observed.
The solid-state structure of WO3·H2O consists of layers of octahedrally coordinated WO5(H2O) units where 4 vertices are shared.
The dihydrate has the same layer structure with the extra H2O molecule intercalated.
The monohydrate is a yellow solid and insoluble in water.
The classical name for this acid is 'acid of wolfram'.
Salts of tungstic acid are tungstates.
Tungstic Acid is used in the production of tungsten metal and its derivatives, fire proofing fabrics and cellulose, reagent for uric acid, alkaloids, plasma proteins, blood sugar, clinical analysis of blood, textile (mordant, color resist) plastics.
Tungstic acid is a yellow shiny sheet crystal or crystalline powder, soluble in water, insoluble in ethanol, slightly soluble in ammonia. Weathered in the air.
Heat to 100 ° C loss of water from the crystallization of anhydrous.
Reacts with strong acid (except hydrofluoric acid) to form water-insoluble yellow tungstic acid, reacts with phosphoric acid or phosphate to form phosphotungstic acid heteropolyacid complex, reacts with organic acids such as tartaric acid, citric acid and oxalic acid to form the corresponding organic acid network Compound.
Tungstic acid occurs as a very light yellow or greyish-yellow powder.
Tungstic acid is obtained by the action of strong acids on solutions of alkali metallic tungstates.
Tungstic acid may also be prepared from the reaction between hydrogen carbonate and sodium tungstate.
Tungstic acid can also be obtained from pure tungsten by reaction with hydrogen peroxide.
Tungstic acid is obtained as an intermediate in the recovery of tungsten from its minerals, scheelite and wolframite
Also, the tungstic acid may be prepared by heating sodium tungstate with sulfuric acid or hydrochloric acid:
Na2WO4 + 2HCl → H2WO4 + 2NaCl
Na2WO4 + H2SO4 → H2WO4 + Na2SO4
Melting point: 100°C (dec.)
Boiling point: 1473°C
Density : 5.5 g/mL at 25 °C (lit.)
refractive index : 2.24
Flash point: 1473°C
storage temp. : Sealed in dry,Room Temperature
form : powder
color : Yellow to yellow-greenish
Specific Gravity : 5.5
Water : Solubility insoluble
Stability: Stable. Incompatible with strong oxidizing agents
Tungstic acid is used as a mordant and a dye in textiles.
Used for mordant, analytical reagent, catalyst, water treatment agent, manufacture of fireproof and waterproof materials, and phosphotungstate, boron tungstate, etc.
Used to manufacture metal tungsten, tungstic acid, tungstate, etc.
Used in mordants, pigments, dyes, inks.
The weaver is used as a fabric weighting agent.
This product is used as a fabric auxiliary.
A mixture of tungstic acid, ammonium ammonium sulfate and the like is used for the fireproofing and waterproofing of the fiber.
This fiber can be made into fireproof rayon and rayon.
Tungstic acid can also be used for leather tanning.
Used for anti-corrosion of electroplating coating.
Used as a co-solvent to introduce enamel color can reduce the firing temperature and complementary color.
Used in the manufacture of petroleum industry and aviation and aerospace materials.
Tungstic acid is used in preparing tungsten metal and many tungsten compounds.
Also, Tungstic acid is a mordant for textiles.
Tungstic acid can be obtained by decomposing a mineral containing calcium tungstate with hydrochloric acid.
Also known as wolframic acid and orth-tungstic acid, it is used in the textile industry, in the production of tungsten filaments and plastic materials.
IUPAC NAME:
Dihydrogen wolframate
dihydrogen wolframate
Dihydroxy(dioxo)tungsten
dihydroxy-dioxotungsten
dioxotungstendiol
SYNONYMS:
11105-11-6
231-975-2
7783-03-1
Dihydroxy(dioxo)tungsten
Dihydroxy(dioxo)tungstène
Dihydroxy(dioxo)wolfram
MFCD00011336
Tungsten, dihydroxydioxo-
Tungstic acid
[WO2(OH)2]
