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Oxides of phosphorus: Preparation, properties, Structure

   Posted On :  10.03.2016 11:20 am

1. Phosphorus trioxide : It is obtained by the combustion of phosphorus in a limited supply of air. , 2. Phosphorus trioxide : Phosphorus pentoxide can be prepared by burning phosphorus with sufficient supply of air.


Phosphorus  -

Atomic Number :  15  Electronic Configuration  :  [Ne] 3s2 3p3  Group Number : 15   Periodic Number  : 3

 

Oxides of phosphorus

 

I Phosphorus trioxide P2O3 or P4O6

It is obtained by the combustion of phosphorus in a limited supply of air.

 

4P + 3O2  2P2O3

 

Physical properties

1.     It is a white waxy substance

2.     It has a garlic odour.

Chemical properties

1. It reacts with cold water, gives phosphorus acid.

 

P2O3 +3H2O 2H3PO3

 

2. It reacts with hot water vigorously to form inflammable phosphine.

 

2P2O3 + 6H2O PH3 � + 3H3 PO4 

 

II Phosphorus pentoxide P2O5 or P4O10

Phosphorus pentoxide can be prepared by burning phosphorus with sufficient

supply of air.

 

P4 + 5O2 P4 O10

Physical properties

It is a white solid and an acidic oxide.

Chemical properties

1.    It reacts with moisture to form metaphosphoric acid.

 

P4O10 + 2H2O 4HPO3

When the solution is boiled, the metaphosphoric acid is changed to

orthophosphoric acid.

 

HPO3 + H2O H3PO4

or

P4O10 + 6H2O 4H3 PO4

2. Phosphorus pentoxide extracts water from many inorganic compound

including sulphuric acid, nitric acid and several organic compounds. It is therefore, used as a powerful dehydrating agent.

Use: It is used as a dehydrating agent.


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