CAS: 13472-45-2
Molecular formula: Na2WO4
Product code: 11740800PD
Purity: 99.9%
Specifications: – 100 mesh
EINECS Number: 680-637-4
Feature
Sodium tungstate is an inorganic compound with the molecular 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 rhombic crystal
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 water
Insoluble in alcohol, acid
Crystal structure: rhombohedral (anhydrous)
Orthorhombic (dihydrate)
Application
The main use of sodium tungstate is as an intermediate for extracting tungsten from its ores, and almost all ores are tungstates. Otherwise, sodium tungstate has only niche applications.
In organic chemistry, sodium tungstate is used as a catalyst for the epoxidation of olefins and the oxidation of alcohols to aldehydes or ketones. It exhibits antidiabetic effects.
Sodium polytungstate solutions are used for density separations because this mixture is less toxic than bromoform and methylene iodide, yet its density is still between that of many naturally coupled minerals.
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