Tungsten Trioxide Basic Properties

Tungsten trioxide molecular weight is 231.85, the theoretical density of 7.16g / cm3, insoluble in water, soluble in acid, slightly soluble in HF, soluble in hot alkali, ammonia. Outer electron structure of tungsten is 5d⁴6s², and therefore the compounds may be presented  +2, +3, +4, +5 and +6 valence state, but different valence states coexist kind of this situation often occurs. Tungsten trioxide is the highest price of tungsten oxide. The oxygen content of WO3 is not usually meet stringent stoichiometric ratio so using WO3-X to represent the type. Because there is different degrees oxygen deficiency, making some W6 + ions are reduced to W5 + ions, forming five or six price of tungsten oxide mixed valence state. After studies, in fact, and W5 + W6 + is present in all of the crystalline tungsten oxide. For example: W18O49 (= WO2.72) can be expressed as W86 + W105 + O49 of patterns. Dopting in WO3-X were pentavalent oxides (such as Nb2O5) can make tungsten in the highest valence state. Under certain conditions, it may be the presence tetravalent oxide of tungsten.

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