Why soaps do not work in hard water?

Q. Why soaps do not work in hard water?
Answer: The insoluble soaps formed separate as scum in water
Notes: Hard water contains calcium and magnesium ions. These ions form insoluble calcium and magnesium soaps respectively when sodium or potassium soaps are dissolved in hard water. These insoluble soaps separate as scum in water and are useless as cleansing agent.

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