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Bismuth Arsenate, BiAsO4

Bismuth Arsenate probably occurs naturally in the minerals atelestite, rhagite, walpurgite and mixite. It may be obtained as a white crystalline substance by the action of arsenic acid or alkali arsenate upon a nitric acid solution of bismuth nitrate. The hemihydrate, BiAsO4H2O, which loses water only when heated strongly, forms microscopic monoclinic prisms, density (at 15° C.) 7.142; it is tasteless and melts only with difficulty. A basic arsenate, 2BiAsO4.3Bi2O3, has also been prepared by the action of sodium arsenate upon an ammoniacal solution of bismuth citrate. It forms a gelatinous precipitate, which resembles the corresponding phosphate in its chemical properties.

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