Chemical EquilibriumHard

Question

The two equilibria, AB(aq) ⇋  A+(aq) + B-(aq) and AB(aq) + B-(aq) ⇋  AB2-(aq) are simultaneously maintained in a solution with equilibrium constants, K1 and K2 respectively. The ratio of concentration of A+ to AB2- in the solution is :

Options

A.directly proportional to the concentration of B- (aq.).
B.inversely proportional to the concentration of B- (aq.).
C.directly proportional to the square of the concentration of  B- (aq.).
D.inversely proportional to the square of the concentration of  B- (aq.).

Solution

AB ⇋ A+ + B-     AB + B- ⇋ AB2-
K1 =         K2 =
K1/K2 = . [B-]2

Therefore, (D) option is correct.

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