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  Phosphorus pentoxide

Phosphorus pentoxide P2O5 or P4O10:

Phosphorus pentoxide can be made by burning phosphorus with adequate supply of air.

P4 + 5O2 → P4 O10

Physical properties:

It is an acidic oxide and a white solid.

Chemical properties:

1. It reacts with moisture to generate metaphosphoric acid.

P4O10 + 2H2O → 4HPO3

Whenever the solution is boiled, the metaphosphoric acid is modified to orthophosphoric acid.

HPO3 + H2O → H3PO4 or
P4O10 + 6H2O → 4H3PO4

2. Phosphorus pentoxide extracts water from numerous inorganic compounds involving sulphuric acid, nitric acid and numerous organic compounds. It is thus, utilized as a powerful dehydrating agent.

578_p2o5.jpg

Use:  

It is employed as a dehydrating agent.

 

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