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Hardness of Water and Treatment

Reaction of c...

Question

Reaction of calgon with hard water containing $C a^{2 +}$ ions produces;

[N a_{2} C a P_{6} O_{18}]^{2 -}

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C a_{2} (P O_{4})_{3}

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C a C O_{3}

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C a S O_{4}

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Solution

The correct option is A $[N a_{2} C a P_{6} O_{18}]^{2 -}$
Reaction of calgon (sodium hexametaphosphate) with hard water containing $C a^{2 +}$ ions produce $[N a_{2} C a P_{6} O_{18}]^{2 -}$ .
$[N a_{4} C a P_{6} O_{18}]^{2 -} + C a^{+ 2} \to [N a_{2} C a P_{6} O_{18}]^{2 -}$ .
The same reaction is also given with $M g^{2 +}$ ions
This method is used to remove permanent hardness of water used for domestic and laundry purposes.

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