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Nernst Equation

What is the r...

Question

What is the reduction electrode potential (in volts) of copper electrode when [ $C u^{2 +}$ ]=0.01M in a solution at $25^{0} C$ ?
(E0 of $C u^{2 +} / C u$ electrode is +0.34)

A

0.3991

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B

0.2809

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C

0.3105

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D

0.3695

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Solution

The correct option is B 0.2809
The Nernst equation for the emf of the copper electrode is $E_{c e l l} = E_{c e l l}^{0} + \frac{0.0592}{n} l o g [{C u}^{2 +}]$ .
Substitute values in the above expression.
$E_{c e l l} = 0.34 V^{0} + \frac{0.0592}{2} l o g 0.01 = 0.2809 V .$

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