1 Ionic Equilibrium
The dissociation constants of monobasic acids A,B,C and D are 6×104, 5 ×105, 3.6×106 and 7×1010 respectively. The pH values of their 0.1 molar aqueous solutions are in the order:
1) A < B < C < D. 2) A > B > C > D 3) A = B = C = D 4) A > B < C > D
Solution:
As the dissociation constant increases (A<B<C<D), dissociation of acid increases (A<B<C<D) and hence [H+] increases (A<B<C<D) and hence pH value decreases (A>B>C>D).
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