Tungstic acid can exist in various states, mostly yellow powder or crystal. Soluble in hydrofluoric acid, slowly soluble in caustic solution, insoluble in water and other acids. The general formula of tungstic acid mWO3•nH2O. There are many known tungstic acids, all of which are polymer compounds formed by combining tungsten trioxide WO3 with water in different ratios and in different forms. Known tungstic acids include yellow tungstic acid, white tungstic acid, and metatungstic acid.
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