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Hardness of Water and Treatment

Both temporar...

Question

Both temporary and permanent hardness is removed on boiling water with :-

C a (O H)_{2}

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N a_{2} C O_{3}

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C a C O_{3}

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C a O

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Solution

The correct option is B $N a_{2} C O_{3}$
Temporary hardness is removed by boiling water with $N a O H$ and $N a_{2} C O_{3}$ . $C a (H C O_{3})_{2} + 2 N a O H \to C a C O_{3} ↓ + N a_{2} C O_{3} + 2 H_{2} O$ Permanent hardness is removed by boiling water with sodium carbonate. $C a C l_{2} + N a_{2} C O_{3} \to C a C O_{3} ↓ + 2 N a C l$

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