Question

For the reaction 2Co3+(aq)+2Cl−(aq)→2Co2+(aq)+Cl2(g). E∘=0.483 V what is the cell potential at 25 ∘C if the concentrations are [Co3+]= 5.50×10−2 M , [Co2+]= 0.149 M , and [Cl−]= 1.50×10−2 M , and the pressure of Cl2 is PCl2= 5.40 atm ? Express your answer with the appropriate units.

Answer 1

th the given reaction there is a 2 electron change (i.e. 2003+ == 2002+) Also, Q=([Co2+72 x PCL2) ([c03+32 x[c1-]®) = 0.149 M) ² x 5:40 atm (5.5 x10-2M) *x (1:50xlo-2M) = 0.022201 x 5:40 0.003025 * 0.000 225 0.1198854 6.806 x 10-7 = 1,76 x10-9 Ecell - Eocell – 0.059 loga 2 0.483 -0.059 log (1-46x10~9) = 0.483 - (- 0.2582) = 0.74124