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Give reasons for the following :(i) Only one half of water molecule is shown in the formula of Plaster of Paris.(ii) Sodium hydrogen carbonate is used as an antacid.(iii) On strong heating, blue coloured copper sulphate crystals turn white.
(i) Only one-half of the water molecule is shown in the formula of Plaster of Paris because 2 formula units of CaSO4 (Calcium sulphate) share 1 molecule of water of crystallization.
(ii) Sodium hydrogen carbonate is used as an antacid because of the alkaline nature it gives relief to the stomach.
(iii) On strong heating, blue coloured copper sulphate crystals turn white:
$CuSO_4.5H_2O(Blue) → CuSO_4 (white) + 5H_2O$
Due to loss of water of crystallization, white colour CuSO4 is obtained.
Updated on: 10-Oct-2022
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