In 1 M NH 3/1 M NH 4 Cl solution, Cu 2+ is reduced to Cu+ near

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In 1 M NH3/1 M NH4Cl solution, Cu2+ is reduced to Cu+ near 20.3 V (versus S.C.E.), and Cu+ is reduced to Cu(in Hg) near 20.6 V.
(a) Sketch a qualitative sampled current polarogram for a solution of Cu+.
(b) Sketch a polarogram for a solution of Cu2+.
(c) Suppose that Pt, instead of Hg, were used as the working electrode. Which, if any, reduction potential would you expect to change?

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