B. Pyrophosphoric acid, H4P2O7:Preparation:
Pyrophosphoric acid is made by heating orthophosphoric acid to 523 K to 533 K.2H3PO4 → H4P2O7 + H2OPhysical Properties:
It is colorless crystalline solid.Chemical Properties:
1. It is retransformed to orthophosphoric acid on boiling with water:H4P2O7 + H2O → 2H3PO42. Whenever heated strongly, it outcomes metaphosphoric acidH4P2O7 → 2ΗPO3 +H2OStructure:
The Structure of pyrophosphoric acid is symbolized as:
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