An electrochemical cell, composed of an iron electrode (anode) immersed in 0.10 M Fe (NO3)2 and silver electrode

electrochemical-cell

#1

An electrochemical cell, composed of an iron electrode (anode) immersed in 0.10 M Fe (NO3)2 and silver electrode (cathode) immersed in 0.11M AgNO3, was found to have a cell potential of 1.21V. The standard reduction potential for Ag+ / Ag half-cell is +0.80V. The standard reduction potential for the Fe+2/ Fe half – cell is -0.45V.

  1. Write the half-cell reaction at the anode.

2.Write the half –cell reaction at the Cathode

3.Write over all cell reaction

Answer:

  1. Fe(s) ---------->Fe2+ +2electron (half-cell reaction at anode)
  2. Ag2+ + 2electron ---------> Ag(s) (half cell reaction at cathode)
    3.Fe(s) + Ag2+(aq.) ------------>Fe2+(aq.) + Ag(s) (overall cell reaction)