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Question

Assertion :Soft water lathers with soap but not hard water Reason: Hard water reacts with soap t form insoluble salts which form scum, not lather

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hard water contains calcium and magnesium salts which react with soap containing sodium stearate (C17H35COONa) to precipitate out Ca/Mg stearate.
2RCOONa+Ca2+(RCOO)2Ca+2Na+
2RCOONa+Mg2+(RCOO)2Mg+2Na+

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