Uranyl Perchlorate, UO₂(ClO₄)₂

Uranyl Perchlorate, UO₂(ClO₄)₂.6H₂O, is prepared by adding perchloric acid to a solution of potassium uranate, filtering off the precipitated potassium perchlorate, and evaporating the filtrate over phosphorus pentoxide. It forms yellow prismatic crystals, which melt at 90° C., and at 100° C. lose water, yielding the tetrahydrate, UO₂(ClO₄)₂.4H₂O.