ElectrochemistryHard

Question

The equilibrium Cu++ (aq) + Cu(s)  ⇋ 2Cu+ established at 20oC corresponds to = 2.02 × 104+. The standard potential, EoCu++,Cu = 0.33 volt at this temperature. What is the standard potential, EoCu++, Cu ?

Options

A.- 0.457 V
B.- 0.125 V
C.- 0.66 V
D.- 0.250 V

Solution

At equilibrium
Eo1 = + log10
= = - 0.254
EoCu2+/Cu+ - EoCu+/Cu
and EoCu+2/Cu =
so Eo1 = 2EoCu+2/Cu = - 2EoCu+2/Cu
EoCu+/Cu = 0.457
EoCu/Cu+ = - 0.457

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