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Understanding Oxidation Numbers and Nernst Equation

Learn how to calculate oxidation numbers and apply the Nernst equation in chemistry. Discover the effect of opposite sign convention and the relationship between ∆G and E. Explore nonstandard E values and watch a video on electrolysis of water.

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Understanding Oxidation Numbers and Nernst Equation

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  1. Chapter 20

  2. Calculating Oxidation Numbers • Each oxide ion has a charge of -2 • 7 oxide ions have a subtotal charge of -2 x 7 = -14 • Since the formula has to be uncharged the 2 manganese ions have to have a +14 subtotal • The +14 subtotal divided evenly over 2 manganese ions gives each manganese +14 / 2 = +7 • This compound is manganese(VII) oxide • Work oxidation numbers of Cr and S in Cr2(SO4)3 (Hint: treat SO42- as a single particle)

  3. Nernst Equation: Analogous to nonstandard ∆G equation • ∆G = ∆Go + RTlnQ • E = Eo - (RT/eF)lnQ • Notice effect of opposite sign convention on direction of deviation from standard value • Notice RT (kJ/mol) becomes RT/eF (J/coul) • R = 0.008314 kJ/mol-K (∆G) vs. R = 8.314 J/mol-K (E) Nonstandard E Values

  4. Electrolysis of Water Play Video On YouTube

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