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Arsenic Phosphate, AsPO4

Arsenic Phosphate, AsPO4, has been prepared by heating pyrophosphoric acid at 230° to 245° C., adding arsenious oxide in small portions, and further heating the mixture at 280° C. until it solidified as a hard mass of white microscopic needles. It is hygroscopic and, when exposed to moist air, arsenious oxide separates. Using an excess of pyrophosphoric acid, a compound of composition 4AsPO4.3H4P2O7 was similarly prepared. It formed a hygroscopic mass of white microscopic needles which melted above 400° C.

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