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

Polyphosphates llike sodium hexametaphosphate (calgon) are used as wat

1.	Polyphosphates llike sodium hexametaphosphate (calgon) are used as water softening agents because they
Answer» form soluble complexes with ANIONIC species precipitate anionic species form soluble complexes with CATIONIC species precipitate cationic species. Solution :Polyphosphates like sodium hexametaphosphate (calgon) form soluble complexes with cations like `Ca^(2+)` and `Mg^(2+)` present in HARD water and hence used as water SOFTENING agents. `Na_(6)P_(6)O_(18)to 2NA^(+)+Na_(4)P_(6)O_(18)^(2-)` `M^(2+)+Na_(4)P_(6)O_(18)^(2-)to [Na_(2)MP_(6)O_(18)]^(2-)+2Na^(+)`