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Beng 130 Handout-4 - K pK K pK o Percent...

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BE.130: Molecular Physical Chemistry Discussion 2/9/04 Chemical Equilibria 1.1 Free energy and equilibrium constant Reading: Ch. 4 pp. 120-143 Important Concepts: o Δ G o = -RTlnK = ° ° Δ - Δ ) ( ) ( nts reacta G n products G n j f j i f i ° ° o Δ G = Δ G o + RTlnQ ° Equilibrium: Δ G=0 o What is the difference between Q and K? Q is the ratio of partial pressures at temperature T K is the equilibrium constant (similar to Q, but at equilibrium) 1.2 Acid-base reactions Reading: Ch. 4 pp. 145-149, 159-165 Important Concepts: o ] ][ [ ] [ ] ][ [ ] [ ] ][ [ - + - - - + = = = OH H K A OH HA K HA A H K w b a o 14 log log = + - = - = b a b b
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Unformatted text preview: K pK K pK o Percent Dissociation/Extent of a Reaction o Buffers: Henderson-Hasselbach: [HA] ] [A log a pK pH-+ = 1.3 Redox reactions • Reading: Ch. 4 pp. 153-158,170-172 • Important Concepts: o Galvanic Cells: cathode=reduction, anode=oxidation o Δ G = -nEF where F is Faraday’s constant, n is the number of electrons involved in the reaction, and E is the reversible voltage of the cell o E°=E°(cathode)-E°(anode) o Nernst equation : Q nF RT ln E E-= & & Equilibrium: E=0...
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