Question

Soap forms insoluble precipitates with calcium and magnesium ions present in hard water.

• A. True
• B. False

Answer 1

The correct option is A

True

Calcium $\left(\text{Ca}\right)$ and magnesium $\left(\text{Mg}\right)$ ions present in hard water form insoluble precipitates with fatty acids in the soap by replacing sodium ions present in it. All the insoluble compounds that are formed after the reaction of soap with hard water is called soap scum.