Batteries and Fuel Cells (Section)
Heart pacemakers are often powered by lithium–silver chromate “button” batteries. The overall cell reaction is
2 Li(s) + Ag2CrO4(s)→ Li2CrO4(s) + 2 Ag(s)
(a) Lithium metal is the reactant at one of the electrodes of the battery. Is it the anode or the cathode? (b) Choose the two half-reactions from Appendix E that most closely approximate the reactions that occur in the battery. What standard emf would be generated by a voltaic cell based on these halfreactions? (c) The battery generates an emf of +3.5 V. How close is this value to the one calculated in part (b)? (d) Calculate the emf that would be generated at body temperature, 37 °C. How does this compare to the emf you calculated in part (b)?
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