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.
Frequently asked questions
What is the correct answer to this question?
Calcium and magnesium ions react with soap to form insoluble scum
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Carbon and its Compounds.
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