Write the chemical formula of Plaster of Paris (POP) and its advantages also

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Detailed Solution

The chemical formula of Plaster of Paris (POP) is: CaSO₄ · ½H₂O

It is called calcium sulphate hemihydrate. POP is prepared by heating gypsum (CaSO₄·2H₂O) at about 150°C:

CaSO₄·2H₂O →_150°C CaSO₄·½H₂O + 1½H₂O

Advantages / Uses of POP:

Quick setting: Used for making casts in fractures and surgical bandages.
Construction & Decoration: Used in false ceilings, wall finishing, and decorative moulds.
Lightweight & Smooth Finish: Provides an even, polished look to surfaces.
Fire-resistant: Protects walls and ceilings from heat.

Final Answer: POP = CaSO₄·½H₂O (calcium sulphate hemihydrate). It is widely used in medicine, construction, decoration, and safety due to its quick-setting and smooth finish.

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