Question 36

An acidified solution of 0.05 M $$Zn^{2+}$$ is saturated with 0.1 M $$H_2S$$. What is the minimum molar concentration (M) of $$H^+$$ required to prevent the precipitation of ZnS?
Use $$K_{sp}(ZnS) = 1.25 \times 10^{-22}$$ and overall dissociation constant of $$H_2S, K_{NET} = K_1K_2 = 1 \times 10^{-21}$$.

Correct Answer: e

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