Description
Phosphotungstic Acid Hydrate
Synonyms :Phosphowolframic Acid; tungstophosphoric Acid
Chemical Formula :H3PO4*12WO3*xH2O
Formula Weight :2898.17
Appearance :Off-White crystalline powder
Turning yellow on exposure to light Assay (with Cinchonine) :65.0% to 70.0%
Insoluble Matter :0.10% maximum
Chloride (Cl) :0.30% maximum
Nitrate (NO3) :0.05% maximum
Sulfate (SO4) :0.20% maximum
Ammonium (NH4) :0.05% maximum
Heavy Metals (as Pb) :0.05% maximum
Iron (Fe) :0.02% maximum
