Question

Why is Plaster of Paris stored in a moisture proof container?

Answer 1

Answer:

Plaster of Paris (POP) should be stored in a moisture-proof container because Plaster of Paris, a powdery mass, absorbs water (moisture) to form a hard solid known as gypsum.

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Answer 2

Answer:

it absorbs water and a irreversible change occurs and it becomes solid

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.