Chapter 4: Changes around us

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Q
Changes around us

Question:

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

Answer:

The chemical name of Plaster of Paris is calcium sulphate hemihydrate. When we add water to it, it becomes hardened due to the formation of a new substance, called gypsum. Here, the chemical composition of Plaster of Paris changes which leads to the formation of gypsum. So, it is a chemical change that cannot be reversed. 


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