Predict FEASIBILITY of the reaction between Ag+ and Cu
We will discuss predicting feasibility of redox reaction between Ag+ and Cu by using standard reduction potential.
Standard reduction potential is a measure of electron gaining power of an electrode. It may be positive or negative.
Positive electrode potential shows that the species is oxidising agent which can pull electrons from another regents. For the redox reaction to be possible, oxidising agent should be more powerful, it means it should be positive.
Ag+ +e = Ag E0 = 0.80 v
Cu -2 e-= Cu2+ E0 = 0.34 v
Since Ag+ has higher potential, that is enough to pull electrons from copper. So, the reaction is feasible.