Vanadyl Selenite, VO₂.SeO₂,2H₂O

Vanadyl Selenite, VO₂.SeO₂.2H₂O, is obtained in blue, microscopic crystals when the hydrate of hypovanadic oxide, VO₂.2H₂O, is dissolved in an aqueous solution of selenous acid and the solution evaporated. Efforts to prepare normal selenates and selenate alums of trivalent vanadium were unsuccessful, but several hydrated aceto- selenates of trivalent vanadium have been isolated.