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  B. Pyrophosphoric acid

B. Pyrophosphoric acid, H4P2O7:

Preparation:

Pyrophosphoric acid is made by heating orthophosphoric acid to 523 K to 533 K.

2H3PO4 → H4P2O7 + H2O

Physical Properties:

It is colorless crystalline solid.

Chemical Properties:

1. It is retransformed to orthophosphoric acid on boiling with water:

H4P2O7 + H2O → 2H3PO4

2. Whenever heated strongly, it outcomes metaphosphoric acid

H4P2O7 → 2ΗPO3 +H2O

Structure:

The Structure of pyrophosphoric acid is symbolized as:

1203_h4p2o7.jpg

 

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