For a hydrogen electrode operating at 25 deg C with P(H2) = 1 atm and [H+] = 0.1 M, what is its reduction potential?

0.00 V
-0.059 V
0.118 V
0.059 V

Correct answer: -0.059 V

Solution

Because [H+] is less than 1 M, the electrode is a weaker reducer of H+ than the SHE, so the reduction potential becomes negative. At [H+] = 0.1 M the shift is exactly -0.059 V.

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