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Posted by on Wednesday, April 25, 2012 at 10:44am.

Using the half reaction potentials calculate the E^o cell for the Ni-Al cell.
Ni (aq) + 2e- <-> Ni (s) -0.25v
Al3+ (aq) + 3e- <-> Al (s) -1.66v

Using that answer determine Ecell for Ni-Al cell when the concentration of Al3+ is 4.00M and the concentration of Ni2+ (aq) is 2.00*10^-5 M.

  • Chemistry - , Wednesday, April 25, 2012 at 4:23pm

    I am unsure about the nomenclature for this. I have set it up for the cell to be spontaneous; the Al is the anode and Ni is the cathode. If the term "Ni-Al cell" means that the cell is non-spontaneous, you will need to reverse everything. Hope this helps.
    Al ==> Al^3+ + 3e Eo = 1.66v
    Ni^2+ + 2e ==> Ni Eo = -0.25
    ----------------------------
    2Al + 3Ni^2+ ==> 2Al^3+ + 3Ni
    Eocell = EAl above + ENi above = 1.66+(-0.25) = ?.

    For the second part:
    Ecell = Eocell - (0.0592/6)log Q
    where Q = (Al^3+)^2(Ni)^3/(Al)^2(Ni^2+)^3 and solve for Ecell.

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