1.

Calgon causes the softening of hard water by

Answer»

perecipitating `Ca^(2+)` and `Mg^(2+)` IONS as phosphates
PRECIPITATING `Ca^(2+)` and `Mg^(2+)` ionsas suphates
SEQUESTRATION of `Ca^(2+)` and `Mg^(2+)` ion
sequestration of `CI^(-)` and `SO_(4)^(2-)` ion

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