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

Explanation:

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