HARDMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumAchiever Section
Assertion: If HA and HB are two weak non-basic acids with Ka(HA) < Kb(HB), then, the aqueous solution of NaA will have higher pH than pH of aqueous solution of NaB of same concentration. Reason: Conjugate base of a weaker acid is stronger than the same of stronger acid.
A.A✓ Correct
B.B
C.C
D.D
Explanation
Hydrolysis constant of salt formed by neutralisation of strong base with weak acid is given as w h a K K K Thus, h a 1 K K ; Higher is ak lower will be hydrolysis and hence less basic will be solution as a 1 pH 7 pK log c 2 Thus, pH of sodium salt NaB formed from HB+NaOH will be lower than pH of solution of NaA of same concentration. As, a a K HA K HB Thus, of NaA > of NaB h h K K Hence, pH of NaA will have higher pH.
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