Ammonium tungsten oxide hydrate is widely utilized as a raw material for the synthesis of tungsten catalysts, which is used in a variety of reactions like oxidation, hydroxylation, hydrogenation and polymerization. It is used as a reagent for chemical analysis like medical diagnosis. It is used as a precursor material for the preparation of high-purity WO₃ which is used as thin-film substrate for certain semiconductor devices. It acts as a precursor to a variety of POM (polyoxometalates).

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