Question

Calculate E^O_Cell for the following examples:

a) Fe(s) | Fe²⁺(0.10 M) | | Cu²⁺(0.10 M) | Cu(s)

b) F₂(g) + 2Cl^-(aq) --> 2F^-(aq) + Cl₂(g)

c) For the combination of a Zn/Zn2⁺ couple and a Ag|AgCl(s) | Cl^-(aq) couple

Answer 1

E^o_cell means the standard reduction potenial of cell which is equal to the difference in cathodic reduction potenial minus anodic reduction potential of cell.

a.In this case E^o_red(Fe²⁺)=-0.44 and  E^o_red(Cu²⁺)=0.16

Thus E^o_cell= E^o_red(Cu²⁺)- E^o_red(Fe²⁺)=0.16-(-0.44)=0.6 volts.

b..

E^o_red(F₂)=2.87 volts and  E^o_red(Cl₂)=1.36

thus, E^o_cell= E^o_red(F₂)-E^o_red(Cl₂)=2.87-1.36=1.51 volts.

c.

E^o_red(Zn²⁺)=-0.76 colts and  E^o_red(Ag/AgCl)=0.22 v

Thus,

, E^o_cell=E^o_red(Ag/AgCl)-E^o_red(Zn²⁺)=0.22-(-0.76)=0.98 Volts