Class 11 Chemistry The S Block Elements Plaster of Paris

Plaster of Paris

The chemical name of Plaster of Paris is Calcium Sulphate (CaSO4·½ H2O)).

It is obtained by heating the gypsum, CaSO4·2H2O, to 393 K.

2(CaSO4·2H2O)  -->  2(CaSO4).H2O + 3H2O

It forms a plastic mass on addition of water which further gets hardened within 5-15 minutes.

It is extensively used in manufacturing decorating pieces, in repairing fractured bones or sprains.

Fig. Plaster of Paris used for plastering fractured bones and in making statues.


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