Which of these ions $C u^{+}, C o^{3 +}, F e^{2 +}$ is stable in the aqueous medium?

Given:
$E_{C u^{2 +} / C u^{+}}^{0} = 0.15 V; E_{C u^{+} / C u}^{0} = 0.53 V E_{C o^{3 +} / C o^{2 +}}^{0} = 1.82 V; E_{F e^{3 +} / F e^{2 +}}^{0} = 0.77 V E_{F e^{2 +} / F e}^{0} = - 0.44 V; E_{O_{2}, H^{+} / H_{2} O}^{0} = 1.23 V$

C u^{+}, C o^{3 +}

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C o^{3 +}

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C u^{2 +}

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C o^{3 +}, C u^{+}, F e^{2 +}

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Solution

The correct option is B $C o^{3 +}$
$C o^{3 +}$ ion is stable in aqueous medium as the value $E_{C o^{3 +} / C o^{2 +}}^{0} = 1.82 V$ is most positive and $C o^{3 +}$ has least tendency to accept an electron and form $C o^{2 +}$ .
$E_{C u^{2 +} / C u^{+}}^{0} = 0.15 V; E_{C u^{+} / C u}^{0} = 0.53 V; E_{C o^{3 +} / C o^{2 +}}^{0} = 1.82 V; E_{F e^{3 +} / F e^{2 +}}^{0} = 0.77 V;$
$E_{F e^{2 +} / F e}^{0} = - 0.44 V; E_{O_{2}, H^{+} / H_{2} O}^{0} = 1.23 V$

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Δ G^{o}

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

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E_{C u^{2 +} / C u^{+}}^{0} = + 0.15 V E_{C u^{+} / C u}^{0} = 0.53 V

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(E^{0} values : F e^{3 +} ∣ F e^{2 +} = + 0.77 V; I_{2} (s) ∣ I^{-} = + 0.54 V; C u^{2 +} | C u = + 0.34 V; A g^{+} ∣ A g = + 0.80 V)

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