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)_
Keep practising Chemical Reactions and Equations
Browse all Chemical Reactions and Equations questions for Andhra Pradesh SSC (Class 10), or explore more Chemistry topics.
Related questions
Balance magnesium burning in oxygen.Which functional group is present in ethanoic acid?Match each reaction type to an example.The functional group present in carboxylic acids is:The functional group present in alcohols is:A soap molecule cleans greasy clothes mainly because:The flame produced when a saturated hydrocarbon burns in plentiful air is:The common name of ethanoic acid, a dilute solution of which is called vinegar, is: