Answer to Question #212692 in Physical Chemistry for James

Question

A common reference electrode consists of a silver wire coated with AgCl(s) and immersed in 1 M KCl (pictured in Question 7).

AgCl (s) + e^- → Ag(s) + Cl^- (1 M)      E° = 0.2223 V

What is E_cell when this electrode is a cathode in combination with a standard zinc electrode as an anode?

Answer 1

Ag + + e - → Ag(s) Eº = 0.799 V. Cl 2+ + 2e - → Cl(s) Eº = 0.337 V

E cell = E cathode – E anode = 0.7946 – 0.1204 = + 0.674 V