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Which of the following compounds is used...

Which of the following compounds is used for water softening ?

A

`Ca_3(PO_4)_2`

B

`Na_3PO_4`

C

`Na_6P_6O_(18)`

D

`Na_2HPO_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("water)") underset("(From hard ")(2CaCl_2)+underset("hexametaphosphate")underset("Sodium")(Na_2[Na_4(PO_3)_6])rarrunderset("Complex salt (soluble)")(Na_2[Ca_(2)(PO_3)_6])+4NaCl`
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