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Cupric arsenate, Cu3(AsO4)2

The Cupric arsenate, Cu3(AsO4)2, occurs as pentahydrate under the name trichalcite. The tetrahydrate is produced by heating cupric nitrate with calcium arsenate, or copper with a solution of arsenic acid, and also by the interaction of cupric chloride and silver arsenate. Concentration at 70° C. of a solution of cupric carbonate in excess of arsenic acid yields pale-blue leaflets of the formula CuHAsO4,H2O. Other acidic salts, and also basic salts, are known.
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