Reaction of Sodium Tungstate with Hydrochloric Acid

Treatment of sodium tungstate with hydrochloric acid gives the tungsten trioxide or its acidic hydrates:

Na2WO4 + 2 HCl → WO3 + 2 NaCl + H2O

Na2WO4 + 2 HCl → WO3·H2O + 2 NaCl

This reaction can be reversed using aqueous sodium hydroxide

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