The standard EMF of the cell :
`Ni|N_(1)^(2+)||Cu^(2+)|Cu" is "0.59 V`. The standard reduction potential of copper electrode is `0.34 V`. Calculate the standard reduction potential of nickel electrode.

Explanation

`E_("cell")^(0) = E_(Cu^(2+)//Cu)^(0) - E_(N_(1)^(2+)//Ni)^(0) `
`0.59 = 0.34 - E_(N_(1)^(2+)//Ni)^(0) `
`E_(N_(1)^(2+)//Ni)^(0) = 0.34 - 0.59 = - 0.25 V`