Plaster of Paris should be stored in a moisture-proof container. Explain why.

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Solution

The plaster of paris should be stored in a moisture-proof container as it is a hygroscopic substance. This means that P.O.P. absorbs moisture (water) from the atmosphere easily resulting in a change in its chemical composition.

${CaSO}_{4} . \frac{1}{2} H_{2} O + 1 \frac{1}{2} H_{2} O \to {CaSO}_{4} .2 H_{2} O Plaster of paris Gypsum$
(Powder) (Hard solid)

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