Question

1. Combine the two reactions above into a single reaction to give the

electrochemical cell and calculate the E◦cell.

Hydrogen ions are also able to act as the cathode.

2H+(aq) + 2e->H2(g) E◦= 0.000 V

Fe2+(aq) + 2e->Fe (s) E◦ = -0.447 V

Answer 1

Since iron has low reduction potential than hydrogen so it will be oxidized and the half reaction of iron will be called the oxidation half and the one having hydrogen will be the reduction half.

The complete equation is given below

Fe(s) + 2H⁺ Fe²⁺ + H₂ (g)

We know, E◦_cell = E◦ _reduction - E◦ _oxidation

E◦_{cell = 0.000 - (-0.447) = 0.447 V}