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Uranyl Arsenates

The orthoar senate, (UO2)3(AsO4)2.12H2O, occurs in nature as trogerite. It is yellow in colour, but on heating turns reddish brown with loss of water; on cooling, the product again becomes yellow. It breaks down when heated with water, yielding micaceous leaflets. The compound has been produced artificially. Uranyl hydrogen arsenate, UO2HAsO4.4H2O, is obtained as a pale yellow powder by the addition of uranyl acetate to a solution of arsenic acid or sodium arsenate. It is insoluble in water and acetic acid.

Uranyl dihydrogen arsenate, UO2(H2AsO4)2.3H2O, separates in small yellow crystals when a solution of uranyl acetate or nitrate containing an excess of arsenic acid is concentrated. The crystals lose their water of crystallisation at 150° C.

Uranyl pyroarsenate, (UO2)2As2O7, remains as a yellow powder when the arsenate, UO2HAsO4.4H2O, or ammonium uranyl arsenate (see below), is heated.

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