Tungstic acid
CAS 7783-03-1
EC 231-975-2
Formula H.1/2O4W
MW 249.85 g/mol
Inorganic Acids Mining & Metals Catalysis
Description
Tungstic acid (CAS 7783-03-1, EC 231-975-2) is an inorganic tungsten compound also known as wolframic acid, H2WO4, or [WO2(OH)2]. It carries no E-code designation and is classified under HS code 28259011. The formula is sometimes written as O2W(OH)2, reflecting its dihydroxo-dioxo tungsten structure.
In the mining and metals sector, tungstic acid serves as a precursor for producing tungsten metal and tungsten carbide, where it is reduced or carburized under controlled high-temperature conditions. It also functions as a heterogeneous acid catalyst in oxidation reactions, activating peroxide-based systems to selectively oxidize organic substrates in fine chemical synthesis.
Tungstic acid is supplied as a light yellow powder compliant with REACH registration requirements for European markets. Procurement teams should confirm supplier documentation for purity grade and batch traceability. Standard packaging formats vary by supplier, and buyers should request a specification sheet to confirm grade suitability for their process.
In the mining and metals sector, tungstic acid serves as a precursor for producing tungsten metal and tungsten carbide, where it is reduced or carburized under controlled high-temperature conditions. It also functions as a heterogeneous acid catalyst in oxidation reactions, activating peroxide-based systems to selectively oxidize organic substrates in fine chemical synthesis.
Tungstic acid is supplied as a light yellow powder compliant with REACH registration requirements for European markets. Procurement teams should confirm supplier documentation for purity grade and batch traceability. Standard packaging formats vary by supplier, and buyers should request a specification sheet to confirm grade suitability for their process.
Physical Properties
| Melting Point | 100°C (dec.) |
| Boiling Point | 1473°C |
| Density | 5.5 g/mL at 25 °C(lit.) |
| Flash Point | 1473°C |
| Appearance | light yellow powder |
| Color | Yellow to yellow-greenish |
| Form | powder |
| Water Solubility | insoluble |
| Refractive Index | 2.24 |
Trade & Regulatory
| HS Code | 28259011 |
| WGK (Germany) | 3 |
Other Names
dihydroxy(dioxo)tungstenH2WO4[WO2(OH)2]tungstic(VI) acidO2W(OH)2Tungsten AcidWolframic acid
Related Products
Raw Materials
Derivatives
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