Nernst’s Equation for Cell EMF
For a cell in which the net cell reaction involving n electrons is,
The Nernst equation is written as,
The is called the standard cell potential.
At 298 K, above eq. can be written as,
It may be noted here, that the concentrations of A, B, C and D referred in the eqs. are the concentrations at the time the cell emf is measured.