Characteristic

 

Sodium tungstate is the inorganic compound with the formula Na₂WO₄. This white, water-soluble solid is the sodium salt of tungstic acid.

Chemical formula:Na₂WO₄

Molar mass:293.82 g/mol

Appearance:White rhombohedral crystals

Density:4.179 g/cm³ (anhydrous);3.25 g/cm³ (dihydrate)

Melting point:698 °C (1,288 °F; 971 K)

Solubility in water:57.5 g/100 mL (0 °C);74.2 g/100 mL (25 °C);96.9 g/100 mL (100 °C)

Solubility:slightly soluble in ammonia;insoluble in alcohol, acid

Crystal structure:Rhombic (anhydrous);orthorhombic (dihydrate)

 

Application

 

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.