Question

What is the equilibrium constant related to only ecell and not ecell?

Answer 1

The voltage of an electrochemical cell is an indication that the system is out of equilibrium. The redox reaction is spontaneously approaching equilibrium, and as the reaction proceeds, electrons flow within the cell. At equilibrium, the voltage drops to zero and the current stops.

Answer 2

As per the Nernst Equation,

Ecell = Eo cell – RT/nF Ln Q

Here Q is the reaction quotient

If we take the value of the equation at the equilibrium then, Ecell = 0, Q = K

0 = Eo cell – RT/nF ln K

Ln K = nFEo cell/RT

Hence, the K constant will be related to the Eo cell but not E cell.