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Polyphosphates llike sodium hexametaphos...

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

A

form soluble complexes with anionic species

B

percipitate anionic species

C

form soluble complexes with cationic species

D

percipitate cationic species.

Text Solution

Verified by Experts

The correct Answer is:
C
Polyphosphates are used as water softening agents because they form soluble complexes with cationsresponsible for the hardness of water.
`2CaSO_(4)+Na_(2)[Na_(4)(PO_(3))_(6)]toNa_(2)[Ca_(2)(PO_(3))_(6)]+2Na_(2)SO_(4)`
`2MgSO_(4)+Na_(2)[Na_(4)(PO_(3))_(6)]toNa_(2)[Mg_(2)(PO_(3))_(6)]+2Na_(2)SO_(4)`
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