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Hardness of Water:Causes, Types and Treatments

Question

Water softening by Clark's process uses:

potash alum
calcium bicarbonate
sodium bicarbonate
calcium hydroxide

A

sodium bicarbonate

B

calcium bicarbonate

C

potash alum

D

calcium hydroxide

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Solution

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Water softening by Clarke's process uses calcium hydroxide (lime). It removes temporary hardness. $C a (H C O_{3})_{2} + C a (O H)_{2} \to 2 C a C O_{3} + 2 H_{2} O$ .

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