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Q.
Which of the following salt undergoes hydrolysis?
Delhi UMET/DPMTDelhi UMET/DPMT 2003
Solution:
Only the salts of strong acid and weak base or weak acid and strong base undergo hydrolysis to produce acidic or alkaline solutions.
(i) $ N{{a}_{2}}S{{O}_{4}} $ : Salt of strong acid $ {{H}_{2}}S{{O}_{4}} $ and strong base $ NaOH $ .
(ii) $NaCl$: Salt of strong acid $ HCl $ and strong base $ NaOH $ .
(iii) $ CaC{{l}_{2}} $ : Salt of strong acid $ HCl $ and strong base $ Ca{{(OH)}_{2}} $ .
$ \because $ $ N{{a}_{2}}S{{O}_{4}},\,NaCl $ and $ CaC{{l}_{2}} $ are salts of strong acid and strong base.
$ \therefore $ They do not undergo hydrolysis.
(iv) $ N{{H}_{4}}Cl $ : Salt of weak base $ N{{H}_{4}}OH $ and strong acid $ HCl $ .
$ \therefore $ $ N{{H}_{4}}Cl $ hydrolyses as follows:
$ N{{H}_{4}}Cl+{{H}_{2}}O\to N{{H}_{2}}OH+HCl $
The resulting solution is acidic because $ HCl $ is strong acid.