Question

The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The reduction potential of the electrode would be ______.

Options

• 0.177 V

• −0.177 V

• 0.087 V

• 0.059 V

Answer 1

The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The reduction potential of the electrode would be −0.177 V.

Explanation:

Given: At 25°C, E° = 0 V, and pH = 3

The electrochemical potential of the hydrogen electrode is given by the Nernst equation.

E = E° − 0.0591 × pH

= 0 − 0.0591 × 3

= −0.177 V