1.

Polyhosphates are usedas water softening agents because they

Answer»

1. formsoluble complexeswith anionic species
2. precipitate anionic species
3. formsolublecomplexes withcationic species
4. precipitatecationic species

Solution :POLYPHOSPHATES such as sodium HEXA meta phosphate combines with CATIONS `Ca^(2)+` or `Mg^(2+)` to form soluble complexes
`2CA^(2+)+Na_(4)[Na_(4)(PO_(3_6))rarr4Na^(2+)+Na_(2)Ca_(2)(PO_(3_6))`


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