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:

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