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Polyphosphates are used for 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.

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Correct Answer - 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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