Question

Plaster of paris should be stored in moisture-proof container. Explain why ?​

Answer 1

Answer:

Plaster of paris is calcium sulphate and addition of water of crystallization to it leads to formation of gypsum which becomes hard material.

Explanation:

Plaster of Paris in contact with moisture (water) changes to solid hard mass, gypsum. Therefore, it gets wasted. Hence it should be stored in moisture proof containers.

Answer 2

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Plaster of paris should be stored in a moisture- proof container because the presence of moisture (or water) can cause it's slow setting by bringing about its hydration. This will make the plaster of Paris useless after the sometime