First slide

Standard EMF of a cell

Question

Given, $E_{I_{2} / I^{-}}^{o} (1 M) = + 0.54 V, and E_{{Br}_{2} / {Br}^{-}}^{o} (1 M) = 1.09 V$ On this basis the feasible reaction is

Easy

A

$2 {Br}^{-} + I_{2} \to {Br}_{2} + 2 I^{-}$
B

$I_{2} + {Br}_{2} \to 2 I^{-} + {2 Br}^{-}$
C

$2 I^{-} + {Br}_{2} \to I_{2} + 2 {Br}^{-}$
D

$2 I^{-} + {2 Br}^{-} \to I_{2} + {Br}_{2}$

Solution

$2 I^{-} \to I_{2} + 2 e^{-} (oxidation)$
$\frac{{Br}_{2} + 2 e^{-} \to 2 {Br}^{-} (reduction)}{2 I^{-} + {Br}_{2} \to I_{2} + 2 {Br}^{-} (net reduction)}$
$E_{cell}^{o} = 1.09 - 0.54 = + 0.55 V$
Positive $E_{cell}^{o}$ means reaction is feasible.

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