Q.

At what temperature is gypsum heated to make Plaster of Paris?

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a

373 K

b

383 K

c

323 K

d

333 K

answer is C.

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Detailed Solution

On heating gypsum at 373 K, gypsum loses water molecules and becomes a calcium sulphate hemihydrate. This is called Plaster of Paris. Its chemical formula is CaSO4·1/2H2O. It is used by doctors as a plaster for supporting fractured bones in the right position.

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At what temperature is gypsum heated to make Plaster of Paris?