§76 Reversible cell 7.6.2 Interfacial reaction-half reaction and electrode reaction Differences between chemical and electrochemical reactions (e 2Fe3++ sn2 2Fe2++ Sn4+ at electrode/solution interface Interfacial reaction Fee sn: @irel half-reactions S Sn4++2 Fe3 2Fe3++2e-)2Fe in bulk solution cathode anode Principle for cell design: To harvest useful energy, the oxidizing and reducing agent has to be separated physically in two different compartments so as to make the electron passing through an external circuitDifferences between chemical and electrochemical reactions 2Fe3+ + Sn2+ ⎯→ 2Fe2+ + Sn4+ half-reactions: Sn2+ ⎯→ Sn4+ + 2e− 2Fe3+ + 2e- ⎯→ 2Fe2+ at electrode / solution interface in bulk solution Interfacial reaction 7.6.2 Interfacial reaction—half reaction and electrode reaction Principle for cell design: To harvest useful energy, the oxidizing and reducing agent has to be separated physically in two different compartments so as to make the electron passing through an external circuit. §7.6 Reversible cell