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Which of the following compounds is u...

Which of the following compounds is used for water softening ?

A

`Ca_(3)(PO_(4))_(2)`

B

`Na_(3)PO_(4)`

C

`Na_(6)P_(6)O_(18)`

D

`Na_(2)HPO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
C
For water softening, sodium hexametaphosphate is used . The chemical formula is `Na_(2)[Na_(4)(PO_(3))_(6)]= Na_(6)P_(6)O_(18).` The trade name is calgon.
`underset("From hard water")(2CaCl_(2)) + underset("hexametaphosphate")underset("Sodium") (Na_(2)[Na_(4)(PO_(3))_(6)]) to underset("Complex salt(soluble)") (Na_(2)[Ca_(2)(PO_(3))_(6)]+4NaCl) `
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