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Question
Using the standard electrode potential, predict if the reaction between the following is feasible:
Ag+(aq) and Cu(s)
Solution
The possible reaction between `"Ag"_(("aq"))^+ + "Cu"_(("s"))` is given by,
\[\ce{2Ag+_{(aq)} + Cu_{(s)} -> 2Ag_{(s)} + Cu^{2+}_{(aq)}}\]
| Oxidation half equation: | \[\ce{Cu_{(s)} -> Cu^{2+}_{ (aq)} + 2e-}\]; E° = - 0.34 V |
| Reduction half equation: | \[\ce{[Ag^+_{ (aq)} + e- -> Ag_{(s)}]× 2}\]; E° = + 0.80 V |
| \[\ce{2Ag+_{(aq)} + Cu_{(s)} -> 2Ag_{(s)} + Cu^{2+}}\]; E° = + 0.46 V |
E° positive for the overall reaction is positive. Hence, the reaction between `"Ag"_(("aq"))^+` and `"Cu"_(("s"))` is feasible.
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