Question

Answer the following:

(a) Why is plaster of Paris written as CaSo4. 1/2 H20? How is it possible to have
half a water molecule attached to CaSo4 ?
(b) Why is sodium hydrogen carbonate 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?

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Answer 1

Explanation:

Please Note that it is not possible to have a half a molecule of water. The Formula actual means that two molecules ( or two formula units ) of CaSO4 share one moecule of water so that the effective water of crystallisation for one CaSO4 unit comes to half molecule of water.