Question

(i) Why is Plaster of Paris written as
CaSO4.12H,O ? How is it possible to
have half a water molecule attached
to CaSO4?
(ii) Why is sodium hydrogen carbonate an
essential ingredient in antacids ?
(iii) When electricity is passed through an
aqueous solution of sodium chloride,
three products are obtained. Why is the
process called chlor-alkali?
rana​

Answer 1

Answer:

(i) Actually 2 molecules of CaSO4 are attracted with 1 molecule of H2O. It was written as CaSo4. 1/2 H2O just to specify no of water molecules per molecules of salt.

(ii) Sodium hydrogen carbonate is an essential ingredient in most antacids because it is slightly alkaline in nature. So, it will react in a appropriate amount.

(iii) Chlor-Alkali stands for Chlorine and Alkaline respectively.

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