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,
Where, 
.
The 
is called the standard cell potential.
or 
At 298 K, above eq. can be written as,
or 
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.
