Question

explain why soaps form scum with hard water whereas detergent do not

Answer 1

Because soaps forms bond with minerals present in hard water but detergent have sulphates which do not forms bond with minerals in hard water

Answer 2

SCUM

scum is the end product or the substance formed when the chemicals in soap reacts with chemicals found in hard water such as calcium or magnesium .

NOTE ; soft water do not have dissolved chemicals .

Hard water have effects on the effectiveness of cleaning agents