Question

Calculate the electrode potential of copper.electrode in contact with 0.1 m CU s o4 solution of 25 degree Celsius the standard electrode potential of copper is 0.34 v​

Answer 1

The electrode potential of copper is 0.3104 Volt.

Given:

Standard electrode potential of copper = 0.34 Volt

Molarity = 1M

To find:

Electrode potential of copper = ?

Solution:

The electrode reaction written as reduction potential is:

$\mathrm{Cu}^{2+}+2 e^{-} \rightarrow \mathrm{Cu}$

Where, n = 2

$E_{ \mathrm{cu}^{2+} / \mathrm{Cu}}=E^{0}_{ \mathrm{cu}^{2+} / \mathrm{Cu}}-\frac{0.0591}{2} \log \frac{1}{[\mathrm{Cu}]}$

Now, on substituting the required values, we get,

$E_{ \mathrm{cu}^{2+} / \mathrm{Cu}}=0.34-\frac{0.0591}{2} \log \frac{1}{0.1}$

$E_{ \mathrm{cu}^{2+} / \mathrm{Cu}}=0.34-\frac{0.0591}{2} \log \frac{1}{1 \times 10^{-1}}$

On taking the power to numerator, we get,

$E_{ \mathrm{cu}^{2+} / \mathrm{Cu}}=0.34-\frac{0.0591}{2} \log 10$

$\because \log 10 = 1$

Thus, we get,

$E_{ \mathrm{cu}^{2+} / \mathrm{Cu}}=0.34-0.02955$

$\therefore E_{ \mathrm{cu}^{2+} / \mathrm{Cu}}=0.3104 \ \mathrm{V}$