Chromium Perchlorate

By dissolving chromium hydroxide in perchloric acid, and subsequent cautious evaporation, short green deliquescent needles of chromium perchlorate, soluble in alcohol, are obtained. Two bluish-green perchlorates, probably derivatives of the hex-aquo base, [Cr(H₂O)₆](ClO₄)₃ and [Cr(H₂O)₆](ClO₄)₃.3H₂O, have been described.