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Hardness of Water and Treatment

Polyphosphate...

Question

Polyphosphates are used as water softening agents because they

Form soluble complexes with anionic species

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Precipitate anionic species

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Forms soluble complexes with cationic species

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Precipitate cationic species

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Solution

The correct option is C
Forms soluble complexes with cationic species

Polyphosphates (sodium hexametaphosphates, sodium tripolyphosphate or STPP) from soluble complexes with $C a^{+ 2}$ , $M g^{+ 2}$ present in hard water.

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