Chemically equivalent amounts of ferric and stannic ions, iron(III) and tin(IV) respectively, are mixed in solution. Calculate the redox potential. The final volume of solution is 120 mL. E^0 = 0.771 for the ferric/ferrous couple; E^0 = 0.154 for the stannic/stannous couple and 2 Fe^3+(aq) + Sn^2+(aq) ? 2Fe^2+(aq) + Sn^4+(aq)