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Barium Pyroarsenate, Ba2As2O7

Barium Pyroarsenate, Ba2As2O7, is obtained by fusing barium oxide with potassium or sodium metarsenate and extracting with anhydrous glycerol. In contact with cold water the hexahydrate, Ba2As2O7.6H2O, is formed.The same crystals are obtained by precipitation from barium chloride and sodium arsenate solutions. With boiling water, barium orthoarsenate is left as a solid, and the solution, on evaporation and calcination, gives barium metarsenate, Ba(AsO3)2.

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