These equations below show two standard reduction potentials. fe3+(aq) + e– fe2+(aq) eo = +0.77 cu2+(aq) + 2e– cu(s) eo = +0.34 which value represents the standard cell potential of the spontaneous overall reaction? use e cell = e red, cathode – e red, anode. –1.11 v –0.43 v +0.43 v +1.11 v

= +0.43 V

The two standard reduction potentials are;

Fe³⁺(aq) + e⁻ → Fe²⁺(aq) E₀ = +0.77 V

Cu²⁺(aq) + 2e⁻ → Cu(s)    E₀ = +0.34 V

The overall reaction is;

Fe³⁺(aq) + Cu(s) → Fe²⁺(aq) + Cu²⁺(aq)

To calculate the standard cell potential of the overall reaction, we use the equation;

Ecell = E redu, cathode - E red, anode

From the reaction; Copper lost electrons to form copper ions (Cu²⁺) (Oxidation) while Fe³⁺ gained electrons to form Fe²⁺ (reduction)

Therefore;

E cell = + 0.77 v - (+0.34 v)

        = + 0.43 V

Hence, the standard cell potential of the overall reaction is +0.43 V