April 12 - Voltaic cell: A spontaneous chemical reaction,...

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April 12, 2010 Standard Potential E o rxn = E o red - E o ox Eo +0.80V Ag+ + e- red. Ag(s) (flipped)+0.36V Pb(s) + SO4 2- ox e- + PbSO4(s) 2Ag+ + Pb(s) + SO 4 2- 2Ag(s) + PbSO 4 (s) = 1.16V Delta G standard = -nFE(standard) =(-2 mol e-) (96485 C /mol e-) (+1.16V) =-223845.2 =-223.4 kJ/moles of reaction Electrochemical Cells Two types – Voltaic cells (aka galvanic), electrolytic cells
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Unformatted text preview: Voltaic cell: A spontaneous chemical reaction, -Delta G, Positive E Provides electrical energy, batteries Electrolytic cells: A non-spontaneous chemical reaction is forced to go forward because of the power of the electrical energy. Split 2 half-reactions. Oxidation goes on the left, reduction on the right....
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