What are the equilibrium concentrations of each half cell?

Question

In the concentration cell shown below, what will be the
concentration of Ni2+ in each half cell when equilibrium is
reached?

           salt bridge
  _________________
  |                             | 
- |-----------------     -|-----------------
| | Ni electrode   |    | | Ni electrode   |
| |                     |    | |                     |
--------------------     -------------------

half cell containing    half cell containing
   1e-3M [Ni2+]              1M [Ni2+]

Options are...
A. The concentration of Ni2+ will be the same, 0.50 M, in each
half-cell.

B. The concentration of Ni2+ will decrease in the left half-cell
until it is 0 M, and increase slightly in the right half-cell.

So far I'm thinking A. Am I right?

Answer 1

Yes, you are correct.  The first time I read this, I didn't notice that it was a CONCENTRATION cell.  In a concentration cell, both anode and cathode are the same (in this case, Ni), and only the concentration of solution bathing them is different. The E_o of the cell will be zero since oxidation and reduction occurring at the anode and cathode are the same.  The cell will discharge until equilibrium is reached.  This will be when concentration of Ni²⁺ is 0.5 M in each compartment.