For the equilibrium- Hg2-2aq - Hgl - Hg2-aqthe equilibrium constant is approximately equal to 103 - Therefore-

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Variable Oxidation States

For the equil...

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For the equilibrium, $H g_{2}^{2 +} (a q) ⇌ H g (l) + H g_{(a q)}^{2 +}$ the equilibrium constant is approximately equal to $10^{3}$ . Therefore,

`Hg(l)` is fairly stable in the aqueous solution

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`Hg(l)` in an aqueous solution undergoes disproportionation to yield both `Hg(l)` and

H g^{2 +}

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Addition of `KCl` shifts the equilibrium to the left

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Addition of

H g (l)

does not have any role on the equilibrium

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Solution

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H g_{2}^{2 +} (a q) ⇌ H g (l) + H g_{(a q)}^{2 +}

10^{3}

H g_{2}^{2 +} (a q) ⇌ H g (l) + H g_{(a q)}^{2 +}

10^{3}

H g^{2 +} + H g \to H g_{2}^{2 +}

E_{(H g | H g^{2 +})}^{⊖} = - 0.788 V; E_{(H g_{2}^{2 +} | 2 H g^{2 +})}^{⊖} = - 0.92 V

K_{e q} = 2.98 \times 10^{x}

x

H g_{2}^{2 +} + 2 e^{-} \to 2 H g ⟹ E^{0} = 0.789 V

H g^{2 +} + 2 e^{-} \to H g ⟹ E^{0} = 0.854 V

H g_{2}^{2 +} \to H g + H g^{2 +}

C u_{(s)} | C u_{(a q)}^{2 +} | | H g_{(a q)}^{2 +} | H g_{(l)}

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