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L38S09_RedoxCellPot+04-27-09,extra+slides

L38S09_RedoxCellPot+04-27-09,extra+slides - Reduction and...

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Unformatted text preview: Reduction and Cell PotentialsChem 1A, L 38: "Reduction Potentials" Cysteine cysteine (H3A+) O cysteine (H2A) O H pKa= 2.2 H O N H H H H H S O N H S pKa= 8.0 H cysteine (HA-) O cysteine (A2-) O O N H H H S O N S pKa= 9.0 H H Free Energy, Voltage ∆G˚ = -nFЄ˚ n = moles of e- transferred F = Faraday’s constant, 96485 C/mol eE = volts, 1 V =1 J/C if Erxn > 0 reaction is product favored, ∆G˚ < 0 ©A.Pines,M.Kubinec,UCB ...
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