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Why does soap not produce good lather in hard water?

Answer and explanation

Correct answer: Calcium and magnesium ions react with soap to form insoluble scum

Hard water contains calcium and magnesium ions. These ions react with soap to form insoluble calcium or magnesium soaps, called scum. Soap is used up in forming this scum, so less soap remains to produce lather. In contrast, dissolved oxygen in water is not responsible for poor lather formation.

Related tags

ScienceClass 10Carbon CompoundsSoapHard WaterLatherCalcium Magnesium Ions

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