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Polyphosphates are used as water softeni...

Polyphosphates are used as water softening agents because they

A

form soluble complexes with anionic species

B

precipitate an ionic species.

C

forms soluble complexes with cationic species.

D

precipitate cationic species.

Text Solution

Verified by Experts

The correct Answer is:
C
Polyphosphates (sodium hexametaphosphates, sodium tripolyphosphate or STPP) form soluble complexes with `Ca^(+2), Mg^(+2)` present in hard water.
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