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Polyphosphates llike sodium hexametaphos...

Polyphosphates llike sodium hexametaphosphate (calgon) are used as water softening agents because they

A

form soluble complexe with anionic species

B

precipitate anionic species

C

form soluble complexes with cationic species

D

precipitate cationic species.

Text Solution

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The correct Answer is:
3
`Na_(2)[Na_(4)(PO_(3))_(6)]+2Ca^(2+)rarrunderset("Soluble complex")(Na_(2)[Ca_(2)(PO_(3))_(2)])+4Na^(+)`
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