Question

Nickel and aluminum electrodes are used to build a galvanic cell. the standard reduction potential for the nickel(ii) ion is −0.26 v and that of the aluminum(iii) ion is −1.66v. what is the theoretical cell potential assuming standard conditions?

Answer 1

The standard cell potential is
E°cell =E° redn(cathode) - E° redn (anode)
Nickel electrodes will become cathode this is because it has a higher reduction potential that is why Al becomes anode.
E°cell=-0.26-(-1.66)=1.4V