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Zirconium Arsenates

Zirconium Orthoarsenate, Zr3(AsO4)4

Zirconium Orthoarsenate, Zr3(AsO4)4.5H2O, has been obtained as a voluminous white precipitate by adding sodium monohydrogen orthoarsenate to a solution of zirconyl fluoride in hydrochloric acid. Zirconium monohydrogen orthoarsenate, Zr(HAsO4)2, appears to be formed slowly by adsorption of arsenic acid by zirconium dioxide.

Zirconyl Pyroarsenate, (ZrO)2As2O7

Zirconyl Pyroarsenate, (ZrO)2As2O7.nH2O, is obtained as a white precipitate when sodium monohydrogen orthoarsenate is added to a solution of zirconium sulphate. When dried at 110° C. the monohydrate, (ZrO)2As2O7.H2O, remains. It is insoluble in water, but readily dissolves in hydrochloric acid.

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