devarshi-dt-logo

Question:

At 298K temperature, a hydrogen gas electrode is made by dipping a platinum wire in a solution of HCl of pH=10 and by passing hydrogen gas around the platinum wire at one atm pressure. The potential of the electrode would be?

0.59V

0.118V

1.18V

0.059V

Solution:

Correct option is A. 0.59V
H₂ → 2H⁺ + 2e⁻
1 atm, 10⁻¹⁰; 0
EH₂/H⁺ = 0 - 0.0592log(10⁻¹⁰)²
EH₂/H⁺ = +0.59V