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Common Ion Effect

What is the m...

Question

What is the minimum $p H$ required to prevent the precipitation of $Z n S$ in a solution that is $0.01 M Z n C l_{2}$ and saturated with $0.10 M H_{2} S$ ?
$(K_{s p} o f Z n S = 10^{- 21}, K_{a_{1}} \times K_{a_{2}} o f H_{2} S = 10^{- 20})$

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Solution

The correct option is B $1$
To prevent IP of ions should not exceed Ksp,
So, $[S^{- 2}] = \frac{K s p}{[Z n^{+ 2}]} = \frac{10^{- 21}}{10^{- 2}} = 10^{- 19}$
$H_{2} S \to 2 H^{+} + S^{- 2}$
$K_{a} = \frac{[H^{+}]^{2} [S^{- 2}]}{[H_{2} S]}, \Rightarrow [H^{+}]^{2} = 0.01; [H^{+}] = 0.1 M$

So, pH $= 1$

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