# How does solution which electrodes are immersed in effect electrode potential?

There was this question I had to do on which went like "which all metals can we not extract using electrolysis from aq soln" the answer involved the effect of solvent on electrode potentials, can someone care to explain/ lead me to sources which will?

The short answer is that we want a cathodic reaction so we can use the metals with a positive standard reduction potential (because 0 is for $$\ce{H2}$$ reduction). In reality however to really find a suitable electrolyte cyclic voltammetry is typically used and electrolytes with suitable electrochemical windows for the cell reaction are chosen.