Question 16

Which of the following compounds is used for water softening ?

(a) $C a_{3} (P O_{4})_{2}$ (b) $N a_{3} P O_{4}$ (c) $N a_{6} P_{6} O_{1} 8$ (d) $N a_{2} H P O_{4}$

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Solution

(c)

For water softening , sodium hexametaphosphate is used. The chemical formula is $N a_{2} [N a_{4} (P O_{3})_{6}] = N a_{6} P_{6} O_{18}$ . The trade name is calgon.

$2 C a C l_{2} \begin{matrix} (F r o m h a r d w a t e r) \end{matrix} + N a_{2} [N a_{4} (P O_{3})_{6} \begin{matrix} S o d i u m h e x a m e t a p h o s p h a t e \end{matrix}] \to N a_{2} [C a_{2} (P O_{3})_{6}] C o m p l e x s a l t (s o l u b l e) + 4 N a C l$

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Name the sodium compound which is used for softening hard water.

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