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Sodium tungstate is the inorganic compound with the formula Na2WO4. This white, water-soluble solid is the sodium salt of tungstic acid. It is useful as a source of tungsten for chemical synthesis. It is an intermediate in the conversion of tungsten ores to the metal.
General Specifications of Sodium Tungstate
Appearance: White Crystalline Powder
Assay: 99% minimum
WO3: 69.0% minimum
Clarity of Solution: 2% solution in distilled water is clear.
Cl: 0.02% maximum
SO4: Maximum 0.01%
Mo: 0.01% maximum
Fe: 100 ppm maximum
Insoluble matter: Maximum 0.01%
pH (5% solution): 8~10
Sodium Tungstate Dihydrate ACS Reagent
Na2WO4 . 2H2O — Formula Wt 329.86
CAS Number 10213-10-2
Assay: 99.0-101.0% Na2WO4 . 2H2O
MAXIMUM ALLOWABLE Insoluble matter: 0.01% Titrable free base: 0.02 meq/g Chloride (Cl): 0.005% Molybdenum (Mo): 0.001% Nitrogen compounds (as N): 0.001% Sulfate (SO4): 0.01% Heavy metals and iron (as Pb): 0.001%