. State reasons for the following occurrences


State reasons for the following occurrences

(i) Soaps do not do the cleansing in hard water

(ii) Synthetic detergents are preferred to soaps in washing machines

                                                               OR

What is the repeating unit in the condensation polymer obtained by combining HO2CCH2CH2CO2H (succinic acid) and H2NCH2CH2NH2 (ethylenediamine)

Best Answer

(i) This is because the Ca2+ and Mg2+ ions present in hard water get precipitated as calcium and magnesium soap which being insoluble stick to the clothes as gummy mass

(ii) This is because detergents can be used in hard water as well as in acidic solutions, as sulphuric acid and their calcium and magnesium salts are soluble in water but the fatty acids and their calcium and magnesium salts are insolubl

ethylenediamine

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