Answer to Question #350012 in General Chemistry for Allie

Question

Write a balanced equation for the overall cell reaction and calculate the standard cell potential, E^0cell.

A. Half-reactions: Cd^2+(aq) + 2e^- —> Cd(s) Cr^2+(aq) + 2e^- —> Cr(s)

Cell reaction:

E^0 cell

B. Half-reactions: Fe^2+(aq) + 2e^- —> Fe(s) Br2(g) + 2e^- —> 2Br^-(aq)

Cell reaction:

E^0cell

Answer 1

The overall cell potential can be calculated by using the equation E0cell=E0red−E0oxid.

A.)

CdSO₄ + Cr = CrSO₄ + Cd

E₀ cell = -0,74 - (-0,4) = -0,34 V

B.)

Fe + Br₂ = FeBr₂

E₀ cell = -0,44 - 1,078 = -1,518 V