Which of the following compounds is used for water softening?
(i) Ca_3 (PO_4)_2
(ii) Na_{3}PO_{4}
(iii) Na_{6}P_{6}O_{18}
(iv) Na_{2}HPO_{4}

Answers (1)

The answer is the option (iii) Na_{6}P_{6}O_{18}

Commercially known as Calgon, sodium hexametaphosphate is used to treat water and make it soft.

 

2CaCl_{2} + Na_{2}[Na_{4}(P0_{3})_{6}] \rightarrow Na_{2}[Ca_{2}(P0_{3})_{6}] + 4NaCl

 

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