What is the potential of the 1/2 cell #Cu^(2+)+2erightleftharpoonsCu# if #[Cu^(2+)]=0.1M?# # E^@=+0.34V#.
The Nernst Equation for the electrode potential of a 1/2 cell gives us:
In reality, activities should be used but molarities are acceptable at low concentrations as
In this case we have:
Putting in the numbers:
This shows that reducing the concentration like this causes a drop in potential.