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Uranous Arsenate, UH2(AsO4)2

Uranous Arsenate, UH2(AsO4)2.2H2O, may be prepared by digesting freshly precipitated uranous hydroxide with cold dilute arsenic acid; or by adding arsenic acid to a solution of the hydroxide in sulphuric acid. It yields pale green needle-shaped crystals, insoluble in water but soluble in excess of arsenic acid. A tetrahydrate, UH2(AsO4)2.4H2O, is formed as a green precipitate when an alkali arsenate is added to a solution of a uranous salt.

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