Quinone undergoes a reversible reduction at a dropping mercury electrode. The reaction is C6H4O2 (quinone) + 2H+ + 2 e- <> C6H4 (OH)2 (hydroxyquinone) E°=0.599 V. Assume that the diffusion coefficient for quinine and hydroxyquinone are approximately the same. Calculate the approximate half-wave potential (vs SCE, E=0.244 V) for reduction of hydroxyquinone at a rotating disk electrode from a solution buffered to a pH of 7.0

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