Tungsten
and oxygen
WO3
is insoluble in acids with the exception of HF, but dissolves easily in aqueous
alkali hydroxide solutions or melts of alkali hydroxides or carbonates. See
Chapter 3 for information about reactions of WO3 with hydrogen, water, and
carbon.
WO3 is one of the
most important, highly pure intermediates for the production of other tungsten
compounds and tungsten metal powder. In the latter application it was substituted
to a large extent by tungsten blue oxide.
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