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Hardness of Water and Treatment

Question

Permanent hardness can be removed by adding:
${C l}_{2}$
${N a}_{2} C O_{3}$
$C a (O C l) C l$
$K_{2} C O_{3}$

A

K_{2} C O_{3}

B

C a (O C l) C l

C

{C l}_{2}

D

{N a}_{2} C O_{3}

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Solution

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The correct option is B ${N a}_{2} C O_{3}$
Permanent hardness is removed by precipitating carbonates of ${C a}^{2 +}$ and ${M g}^{2 +}$ .

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