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Q2.(a) Why is...

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Q2.(a) Why is plaster of paris written as CaSO4.1/2 H2O? How is it possible to have half a water molecule attached to CaS4O?
Give any two important uses of this compound.

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Solution

The chemical formula of plaster of Paris is CaSO₄.1/2H₂O. This basically indicates that two units of calcium sulphate share one molecule of water. The uses of this compound are as follows:
1) It is used by doctors as plaster for supporting fractured bones in the right position.
2) It is also used for making toys, materials for decoration and for making surfaces smooth.

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Q. Answer the following:
(a) Why is plaster of Paris written as

{CaSO}_{4} . \frac{1}{2} H_{2} O

? How is it possible to have half a water molecule attached to CaSO₄?
(b) Why is sodium hydrogencarbonate an essential ingredient in antacids?
(c) When electricity is passed through an aqueous solution of sodium chloride, three products are obtained. Why is the process called chlor-alkali?

Q. Why does plaster of Paris have 1/2 molecule of water? Why does 2 CaSO4 molecules share one molecule of water?

Q. Plaster of Paris is known as calcium sulphate hemihydrate because two formula units of

C a S O_{4}

share one molecule of

H_{2} O

.

Q. (a) What is plaster of Paris? Write the chemical formula of plaster of Paris.
(b) How is plaster of Parish prepared? Write chemical equation of the reaction involved.
(c) Explain why plaster of Paris should be stored in a moisture-proof container.
(d) State two important uses of plaster of Paris.

Q. Write any two uses of Plaster of Paris?

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