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Question

why is CaSO4.12H2O caed plaster of paris?

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Solution

Plaster of Paris gets its name from large gypsum deposits in Montmartre in Paris. We know that plaster of Paris, which is chemically calcium sulphate hemihydrate is obtained by heating gypsum. So the origin of the name 'Plaster of Paris' is the fact that the source material gypsum is found in large deposits at Montmartre in Paris.

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(a) What is plaster of Paris? Write the chemical formula of plaster of Paris.

(b) How is plaster of Paris prepared? Write the 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.

Why calcium sulphate hemihydrate is called plaster of Paris?

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. Plaster of paris is

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