alleryWhy do soaps NOT work well in hard water?
AThey evaporate under typical conditions
BThey form insoluble salts with Ca and Mg ions
CThey turn alkaline
DThey become acidic
Answer & Solution
Correct answer: B. They form insoluble salts with Ca and Mg ions
1. Hard water contains dissolved calcium and magnesium salts.
2. Soap reacts with these ions instead of cleaning fabrics.
3. Insoluble curdy precipitates of Ca and Mg salts form.
4. These precipitates do not foam and do not remove dirt.
5. So soaps lose cleaning power in hard water.
_Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_
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