Question

Calgon causes the softening of hard water by
A. sequestraction of `Ca^(2+)` and `Mg^(2+)` ion
B. sequestraction of `Cl^(-)` and `SO_(4)^(2-)` ion
C. precipitating the `Ca^(2+)` and `Mg^(2+)` ions as phophates
D. precipitating the `Ca^(2+)` and `Mg^(2+)` ions as sulphates.

Answer 1

Correct Answer - A
It causes sequestration of `Ca^(2+)` and `Mg^(2+)` of hard water.