Bismuth Pyrophosphate, Bi₄(P₂O₇)₃

Bismuth Pyrophosphate, Bi₄(P₂O₇)₃, has, however, been prepared by the action of bismuth trioxide on molten microcosmic salt.6 It is a white, amorphous powder, almost insoluble in water but decomposed by it. A complex salt, sodium bismuthipyrophosphate, Na(BiP₂O₇).3H₂O, been prepared by dissolving bismuth pyrophosphate in sodium pyrophosphate. In this compound the bismuth appears to form part of the anion.