At the same time voltage of the cell as read on the voltmeter keeps
on decreasing After some time, we shall note that there is no change
in the concentration of Cu2+ and Zn2+ ions and at the same time,
voltmeter gives zero reading This indicates that equilibrium has been
attained In this situation the Nernst equation may be written as:
E(cell) = 0 = 
(
)
o
Ecell
 – 
2