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 ?
= 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
Eo1 = +
log10=
= - 0.254EoCu2+/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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