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What is the insoluble substance formed when soap is used in hard water called?

Answer and explanation

Correct answer: Scum

The governing concept is the reaction of soap with hard-water ions. Hard water contains dissolved calcium and magnesium ions. These ions react with the soap’s fatty-acid anions to form insoluble calcium or magnesium salts, which appear as a deposit called scum; therefore, option A is correct. Lather is the useful foam produced by soap, while an ester is an organic compound and a detergent is a different cleansing agent.

Related tags

ScienceClass 10Carbon CompoundsSoapsDetergentsHard WaterScumSoaps And Detergents

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