Question

In the laboratory of a school, the sample of hard water is not available "to study the comparative cleaning capacity of a sample soap in soft and hard water". Which salt from the laboratory can be added to tap water to make it hard ? In the experiment how is cleaning capacity of soap compared ?

PLEASE GIVE ME THE ANSWER FAST :(

Answer 1

Hard water, water that contains salts of calcium and magnesium principally as bicarbonates, chlorides, and sulfates. Ferrous iron may also be present; oxidized to the ferric form, it appears as a reddish brown stain on washed fabrics and enameled surfaces.