Chem notes 4-13.docx - Chem notes 4/13(read 18.6-18.9 do 73...

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Chem notes 4/13 (read 18.6-18.9 ; do 73, 63, 87, 89, 99) Oxidizing and reducing agents oxidizing agent – acts in the cause of oxidation - causes another species to be oxidized - wants electrons - it is reduced in the rxn reducing agent – acts in the cause of reduction - causes another species to be reduced - gives up electrons - it is oxidized in the rxn The Nernst Equation - gives the cell voltage when the reagents are not in standard states recall ΔG = ΔG° + RTlnQ ΔG° = - nFΔE° ΔG = - nFΔE substitute: - nFΔE = - nFΔE° + RTlnQ ΔE = ΔE° - (RT/nF) lnQ convert to log base 10 ΔE = ΔE° - (2.303 RT/nF) logQ ΔE = ΔE° - (0.0592V/nF) logQ So, if species are not in their standard states (i.e. concentrations are not 1.00 M) the cell voltage is modified - calculate Q, ΔE°, then calculate ΔE
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