Tungstic Acid:WO3•H2O and WO3•2H2O

Hydrates of Tungsten Trioxide, Tungstic Acid. - Two well defined hydrates of tungsten trioxide are known:

1.A yellow monohydrate, WO3.H2O, and

2.A white dihydrate, WO3.2H2O. With bases, both hydrates produce the same series of salts, and the first appears to be the true acid, tungstic acid, H2WO4, whilst the second is the hydrate, H2WO4.H2O. Both are insoluble in water, but colloidal forms of the acid exist. Several other hydrates have been described, but except in the case of the complex hydrate known as metatungstic acid their existence has not been established.

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