Question

For the cell reaction represent as
Co/Cos+//Not+/Ni
Calculate the cell potential and free energy of reaction

Answer 1

Standard electrode potential Co/Co2+E°L=-0.7 V and Ni2+/Ni E°R=-0.24

Cell potential:

$E°=E°R-E°L$

E°=-0.24-(-0.27)=0.03 (V)

Free energy or Gibbs energy:

$∆G=-n∙F∙E°$ ,

n is the number of electrons participating in the reaction; F-Faraday number 96485 C∙mol-1

∆G=-2∙96485-0.03=-5789.1 J/mol