The two equilibria AB⇌A++B− and AB+B−⇌AB−2 are simultaneously maintained in a solution with equilibrium constants, K1 and K2 respectively. The ratio of A+ to AB−2 in the solution is
A
inversely proportional to the square of the concentration of B−
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B
directly proportional to the square of the concentration of B−
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C
inversely proportional to the concentration of B−
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D
directly proportional to the concentration of B−
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Solution
The correct option is Ainversely proportional to the square of the concentration of B− Given the reactions: AB⇌A++B− and AB+B−⇌AB−2
K1=[A+][B−][AB];K2=[AB−2][AB][B−]
∴K1K2=[A+][B−]2[AB2]−
∴[A+][AB2]∝1[B−]2
Hence, the ratio of A+ to AB−2 in the solution is inversely proportional to the square of the concentration of B−.