Question:
The chemical name of plaster of Paris is
The chemical name of plaster of Paris is
Updated On: Apr 7, 2025
- calcium sulphate monohydrate
- calcium sulphate
- calcium sulphate dihydrate
- calcium sulphate hemihydrate
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The Correct Option is D
Solution and Explanation
Plaster of Paris (POP) is chemically known as calcium sulphate hemihydrate. Its chemical formula is: \[ \text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O} \] It is obtained by heating gypsum (CaSO$_4$·2H$_2$O) to about 373 K: \[ \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \xrightarrow{373\,K} \text{CaSO}_4 \cdot \frac{1}{2}\text{H}_2\text{O} + \frac{3}{2}\text{H}_2\text{O} \] This hemihydrate form sets into a hard mass when mixed with water, which is why it is used in casts, sculptures, and building materials.
The correct option is (D): calcium sulphate hemihydrate
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