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Tungstic acid refers to hydrated forms of tungsten trioxide, WO3. The simplest form, the monohydrate, is WO3·H2O, the dihydrate WO3·2H2O is also known.
Specifications of Tungstic Acid
Description: A fine yellow powder.
Solubility: Insoluble in water. Soluble in caustic alkali.
Minimum assay (Acidimetric, on ignited subs.): 99.0%
MAXIMUM LIMIT OF IMPURITIES
Substance insoluble in sodium hydroxide solution: 0.2%
Chloride (Cl): 0.02%
Sulphate (SO4): 0.2%
Calcium (Ca): 0.01%
Iron (Fe): 20 ppm.