Question

why pop used for bandage for fractures bones​

Answer 1

POP(Plaster of Paris) is a surgical bandage used for plastering broken or fractured bones.

Explanation:

• Plaster of Paris is calcium sulphate hemihydrate with molecular formula= $CaSO_4.\frac{1}{2}H_2O$ .
• Plaster of Paris is used for bandage because of its high setting rate.
• It has remarkable property of setting with water. On mixing with one third its weight of water, it forms a plastic mass which sets into a hard mass of interlocking crystals of gypsum within 5 to 15 minutes. It is due to this reason that it is called plaster.
• $2CaSo_4.\frac{1}{2}H_2O + 3H_2O \rightarrow 2CaSO_4.2H_20$.
• The setting of Plaster of Paris is believed to be due to rehydration and its reconversion into gypsum.