What arbitrary reference potential is assigned to the standard hydrogen electrode (SHE) at all temperatures?
Answer and explanation
Correct answer: B. 0.00 V
The standard hydrogen electrode (SHE), consisting of a platinized platinum electrode immersed in an acidic solution with [H+] = 1.0 M and bubbling H2 gas at 1.0 atm (25 °C), is defined internationally by IUPAC as the universal zero reference point: E° = 0.00 V for the half-reaction 2 H+(aq) + 2 e- <=> H2(g).
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