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Effect on Kc

Cu2+ ions rea...

Question

${C u}^{2 +}$ ions react with ${F e}^{2 +}$ ions according to the following reaction:
${C u}^{2 +} + 2 {F e}^{2 +} ⇌ C u + 2 {F e}^{3 +}$
At equilibrium, the concentration of ${C u}^{2 +}$ ions is not changed by the addition of:

{C u}^{2 +}

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{F e}^{2 +}

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C u

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{F e}^{3 +}

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Solution

The correct option is C $C u$
${C u}^{2 +}$ ions react with ${F e}^{2 +}$ ions according to the following reaction:
${C u}^{2 +} + 2 {F e}^{2 +} ⇌ C u + 2 {F e}^{3 +}$
At equilibrium, the concentration of ${C u}^{2 +}$ ions is not changed by the addition of $C u$ .
$C u$ is a solid and it's concentration does not appear in the equilibrium constant expression.

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M g

F e

C u^{2 +}

M g_{(s)} + C u^{2 +} ⇋ M g^{2 +} + C u_{(s)}; K_{1} = 6 \times 10^{90}

F e_{(s)} + C u^{2 +} ⇋ F e^{2 +} + C u_{(s)}; K_{2} = 3 \times 10^{26}

C u^{2 +}

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F e^{2 +} + 2 e^{-} \to F e

E^{\circ} = - 0.44 V

C u^{2 +} + 2 e^{-} \to C u

E^{\circ} = + 0.34 V

E^{\circ}

F e + C u^{2 +} ⇋ F e^{2} + C u

C u^{2 +}

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C u_{(s)} + 2 A g_{(a q)}^{+} \to C u_{(a q)}^{2 +} + 2 A g_{(s)}

E_{c e l l}^{o} = + 0.46

C u^{2 +}

E_{c e l l}^{o}

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