Antimony Pyrophosphate, 2Sb₂O₃.3P₂O₅

Antimony Pyrophosphate, 2Sb₂O₃.3P₂O₅, is obtained by dissolving antimony trioxide in orthophosphoric acid; and by boiling the trioxide with a solution of sodium pyrophosphate. By hydrolysis two other substances are obtained, 4Sb₂O₃.P₂O₅ and 2Sb₂O₃.P₂O₅.