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Representation of Cell

Ni|Ni2+1.0M||...

Question

$N i | N i^{2 +} (1.0 M) | | A u^{3 +} (1.0 M) | A u$ (where $E^{o}$ for $N i^{2 +} / N i$ is $- 0.25$ and $V$ and $E^{o}$ for $A u^{3 +} / A u$ is $0.150 V$ ). What is the emf of the cell?

+ 0.4 V

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- 1.75 V

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+ 1.25 V

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+ 1.75 V

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Solution

The correct option is B $+ 0.4 V$
$N i | N i^{2 +} (1.0 M) | | A u^{3 +} (1.0 M) | A u$
$E_{c e l l}^{o} (A u^{3 +} / A u) = 0.15 V$
$E_{c e l l}^{o} (N i^{2 +} / N i) = - 0.25 V$
$E_{c e l l}^{o} = E_{c a t h o d e}^{o} - E_{a n o d e}^{o}$
$= 0.150 - (- 0.25)$
$= + 0.4 V$
The correct answer is $= + 0.4 V$

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Similar questions

N i | N i^{2 +} (1.0 M) | | A u^{3 +} (1.0 M) | A u

E^{\circ}

N i^{2 +} | N i

- 0.25 V; E^{\circ}

A u | A u^{3 +}

1.50

The EMF of the cell : Ni(s) | Ni²⁺ (1.0M) || Au ³⁺(1.0M) | Au (s) is

[ given E^o_Ni²⁺_/Ni -0.25V; E° _Au³⁺_{/ Au} = +1.50V ]

E^{o} ({N i}^{2 +} / N i) = - 0.25 v o l t, E^{o} ({A u}^{3 +} / A u) = 1.50 v o l t

N i | {N i}^{2 +} (1.0 M) ∥ {A u}^{3 +} (1.0 M) | A u

N i | N i^{2 +} (1.0 M) | | A u^{2 +} (1.0 M) | A u

E^{0}

N i^{2 +} | N i

- 0.25

E^{0}

A u^{+ 2} | A u

1.50

N i | N i^{2 +} | | A u^{3 +} | A u

N i^{2 +} | N i; E^{\circ} = - 0.25 V

A u^{3 +} | A u; E^{\circ} = 1.5 V

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