[offlinedoctor]

For the following question:
'Ni -> Ni²⁺+2e^- E°=-0.25
Co -> Co²⁺+2e^- E°=-0.28. If [Ni²⁺]=0.8M and [Co²⁺]=0.2M and, Ecell = 0.025, determine the concentration of Ni²⁺ at this point'.

What I did was:
1. Nernst Equation:
0.025 = 0.03 - 0.0591/2 x log (Co²⁺/Ni²⁺)
But I'm having trouble finding the concentration of Ni²⁺ at this point, when Ecell =0.025, because I've got two unknowns (Cu²⁺ aswell).
I was thinking of using the ICE table but wouldn't know if that would help in anyway.

[Borek]

ICE table (or more generally - applying reaction stoichiometry) would be my approach as well.