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Vanadyl sulfate
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<p>Vanadyl(IV) sulfate describes a collection of <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compounds</a> of vanadium with the formula, VOSO4(H2O)x where 0 ≤ x ≤ 6. The pentahydrate is common. This hygroscopic blue solid is one of the most common sources of <a href="/facts/Vanadium/UvKkKTSm">vanadium</a> in the laboratory, reflecting its high stability. It features the <a href="/facts/Vanadyl/Guma1f7r">vanadyl</a> ion, VO2+, which has been called <i>the</i> "most stable diatomic ion". </p><p>Vanadyl sulfate is an intermediate in the extraction of vanadium from petroleum residues, one commercial source of vanadium. </p>