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A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be ?

1. 0.59 V
2. 0.118 V
3. 1.18 V
4. 0.059 V

Correct answer: 0.118 V

Solution

The oxidation potential of the hydrogen electrode is calculated using the Nernst equation. For pH = 10, the concentration of H+ ions is 10^-10 M. Substituting this into the Nernst equation gives an oxidation potential of 0.118 V.

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