Question

A thick coating of a paste of Plaster of Paris (POP) ts applied over the bandage a fractured bone. It becomes hard on drytng to keep the fractured bone immobilised. Can the change in POP be reversed?

Answer 1

$\textbf{No, }$ you can't change POP after drying into its initial form.

This is because it became hard on drying and new products is formed which can't be reversed.

You can also call it as a chemical reaction.

$\textbf{POP}$

It is prepared from gypsum. Gypsum is calcium sulphate dihydrate.

It is a white powder, and have a remarkable property of setting into a hard mass on wetting with water.