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Oxidation and Reduction

Write half-re...

Question

Write half-reactions using electrons.

$2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} ⟶ 10 {C O}_{2} + 2 {M n}^{2 +} + 8 H_{2} O$

Oxidation

: C_{2} O_{4}^{2 -} ⟶ 2 C O_{2} + 2 e^{-}

; Reduction

: M n O_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ {M n}^{2 +} + 4 H_{2} O

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Oxidation

: C_{2} O_{4}^{2 -} ⟶ 2 C O_{2} + e^{-}

; Reduction

: M n O_{4}^{-} + 8 H^{+} + 3 e^{-} ⟶ {M n}^{2 +} + 3 H_{2} O

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Oxidation

: C_{2} O_{4}^{2 -} ⟶ 2 C O_{2} + 2 e^{-}

; Reduction

: M n O_{4}^{-} + 8 H^{+} + 7 e^{-} ⟶ {M n}^{3 +} + 8 H_{2} O

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Oxidation

: C_{2} O_{4}^{-} ⟶ 2 C O_{2} + e^{-}

; Reduction

: M n O_{4}^{-} + 8 H^{+} + e^{-} ⟶ {M n}^{3 +} + 6 H_{2} O

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Solution

The correct option is A Oxidation $: C_{2} O_{4}^{2 -} ⟶ 2 C O_{2} + 2 e^{-}$ ; Reduction $: M n O_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ {M n}^{2 +} + 4 H_{2} O$
The balanced chemcial equation represents the oxidation of oxalate ions with permanganate ions.
$2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} ⟶ 10 {C O}_{2} + 2 {M n}^{2 +} + 8 H_{2} O$
The oxidation half reaction is $: C_{2} O_{4}^{2 -} ⟶ 2 C O_{2} + 2 e^{-}$ .
It represents oxidation of oxalate ions to carbon dioxide.
The reduction half reaction is $: M n O_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ {M n}^{2 +} + 4 H_{2} O$ .
It represents the reduction of permanganae ions to Mn(II) ions.

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Similar questions

E_{M n O_{4}^{-} | M n O_{2}}^{\circ}

M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O

E^{\circ} = 1.51 V

M n O_{2} + 4 H^{+} + 2 e^{-} \to M n^{2 +} + 2 H_{2} O

E^{\circ} = 1.23 V

5 {F e}^{2 +} + M n O_{4}^{-} + 8 H^{+} ⇌ {M n}^{2 +} + 5 {F e}^{3 +} + 4 H_{2} O

{F e}^{3 +} + e^{-} ⟶ {F e}^{2 +}, {E_{1}}^{o}

M n O_{4}^{-} + 8 H^{+} + 5 e^{-} ⟶ {M n}^{2 +} + 4 H_{2} O, {E_{2}}^{o}

E_{R P}^{o}

M n O_{4}^{-} (a q) + 8 H^{+} + 5 e \to M n^{2 +} (a q) + 4 H_{2} O (l); E^{o} = + 1.52 V

M n O_{4}^{2 -} (a q) + 4 H^{+} + 2 e \to M n O_{2} (s) + 2 H_{2} O (l); E^{o} = + 2.26 V

2 M n O_{4}^{-} (a q) + 2 e \to 2 M n O_{4}^{2 -} (a q); E^{o} = + 0.56 V

M n^{3 +} + e \to M n^{2 +}; E^{o} = + 1.51 V

M n^{4 +} + e \to M n^{3 +}; E^{o} = 0.95 V

M n O_{4}^{⊖}

M n O_{4}^{⊖} + 8 H^{\oplus} + 5 e^{-} \to M n^{2 +} + 4 H_{2} O

H^{\oplus}

M n O_{4}^{⊖}, M n^{2 +} | P t

{2 m n O}_{4}^{-} + 6 H^{+} + {5 H}_{2} C_{2} O_{4} ⇌ {2 M N}^{2 +} + 8 H_{2} O + {10 C O}_{2}

E_{{M n O}_{4} M n^{2 +},}^{0} = 1.51 V

E_{{C O}_{3} C_{2} O_{4}^{2 -}}^{0} = - 0.49 V

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