Polyphosphates are used for softening agents because they

Options

A. form soluble complexes with anionic species
B. precipitate anionic species
C. form soluble complexes with cationic species
D. preipitate cationic species

Answer

C

Explanation

It sequesters `Ca^(2+)` and `Mg^(2+)` (present in hard water) and forms soluble complex with `Ca^(2+)` and `Mg^(2+)` which do not precipitate with `CO_(3)^(2-)` and soap.