First slide

Hardness of water

Question

Hardness of water is due to presence of salts of

Easy

A

${Na}^{+} and K^{+}$
B

${Ca}^{2 +} and {Mg}^{2 +}$
C

${Ca}^{2 +} and K^{+}$
D

${Ca}^{2 +} and {Na}^{+}$

Solution

Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of Ca and Mg on it. These ${Ca}^{2 +} and {Mg}^{2 +}$ ions react with the anions of fatty acids present in soaps to form curdy white precipitates. As a result, hard water does not produce lather with soap immediately.

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