Quinone undergoes a reversible reduction at a voltammetric
working electrode. The reaction is
(a) Assume that the diffusion coefficients for quinone and
hydroquinone are approximately the same and calculate the approximate half-wave
potential (versus SCE) for the reduction of hydroquinone at an RDE from a
solution buffered to a pH of 8.0.
(b) Repeat the calculation in (a) for a solution buffered to
a pH of 5.0.