The Nernst equation giving dependence of electrode reduction potential on concentration is

Explanation

For the electrode reaction, `M^(n+)//n e^(-)toM`
`E_(M^(N+)//M)=E_(M^(n+)//M)^(@)-(2.303RT)/(nF)"log"([M])/([M^(n+)])=E_(Mn^(2+)//M)^(@)-(2.303RT)/(nF)"log"(1)/([M^(n+)])`.