Exercise 5 | Electrochemistry

E0cell = 0.47 V at 25°C for the following reaction:

Pb (s) + Cu2+ (aq) Pb2+ (aq) + Cu (s)


What is the value of the equilibrium constant?

Nernst equation at the equilibrium:
 

At 25°C:
 

Ecell = E0cell0.02570νe  ln K = 0   (equilibrium)


E0cell = standard cell voltage (in V)
νe = stoichiometric coefficient of the electrons = 2
K = equilibrium constant

 

E0cell0.02570νe ln K = 0

K = exp E0cell × νe0.02570

K = 7.7 x 1015