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Dissolution of Solids and Gases in Liquid

HgCl 2 and I ...

Question

$H g C l_{2}$ and $I_{2}$ both when dissolved in water containing $I^{-}$ ions, the pair of species formed is:

H g I_{2}, I_{3}^{-}

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H g I_{2}, I^{-}

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H g I_{4}^{2 -}, I_{3}^{-}

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H g_{2} I_{2}, I^{-}

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Solution

The correct option is C $H g I_{4}^{2 -}, I_{3}^{-}$
In a solution containing $H g C l_{2}, I_{2}$ and $I^{-}$ , both $H g C l_{2}$ and $I_{2}$ compete for $I^{-}$ .
Since the formation constant of $[H g I_{4}]^{2 -}$ is $1.9 \times 10^{30}$
which is very large as compared to $I_{3}^{-} (K_{f} = 700)$ , $I^{-}$ will preferentially combine with $H g C l_{2}$ .

$H g C l_{2} + 2 I^{-} \to H g I_{2} R e d p p t ↓ + 2 C l^{-}$
$H g I_{2} + 2 I^{-} \to [H g I_{4}]^{2 -} s o l u b l e$

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