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Silver pyrophosphate, Ag4P2O7

Precipitation of sodium pyrophosphate with Silver nitrate yields the Silver pyrophosphate, Ag4P2O7, in the form of a white powder, fusible at red heat. Secondary sodium orthophosphate converts it into silver orthophosphate. A double salt of the formula NaAg3P2O7 is also known. On heating, its colour changes from white to yellow, a phenomenon which has been attributed to decomposition into sodium metaphosphate and silver orthophosphate, but which is considered by Balareff to have probably a physical origin.
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