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Lead Pyrophosphate, Pb2P2O7

Lead Pyrophosphate, Pb2P2O7, is precipitated as a white, amorphous powder when a solution of a pyrophosphate is added to a lead salt solution; and is also obtained when lead oxide is fused with potassium metaphosphate and the melt is extracted with water. Water-vapour at 280°-300° C. converts it into orthophosphate. Various hydrates and double salts of lead pyrophosphate have been described. It is noteworthy that this salt shows so little tendency to pass into orthophosphate. A hydrate of sodium pyrophosphate would probably be impossible.

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