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Lecture 09 Handout - Slide1 2003ByDefault ExperimentNein...

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1 © 2003 By Default! A Free sample background from www.awesomebackgrounds.com Slide 1 Experiment Nein! Experiment Nein! Acid Acid­ Base Base Equilibria Equilibria CH 204 Fall 2008 Fall 2008 Dr. Brian Anderson Dr. Brian Anderson © 2003 By Default! A Free sample background from www.awesomebackgrounds.com Slide 2 Last Week Last Week Heat in chemical reactions: heat is a measurable quantity heat is a measurable quantity produced and consumed in produced and consumed in stoichiometric stoichiometric amounts amounts Heat Capacity (J/K): how much heat is required to raise the temperature of something by one degree Celsius (or 1 Kelvin) Specific Heat Capacities (J/ gK gK ): Lead 0.128 Iron 0.449 Water 4.184 Hess’s Law Hess’s Law © 2003 By Default! A Free sample background from www.awesomebackgrounds.com Slide 3 This week This week Weak acid titration. Weak acid titration. Determine K Determine K a of acetic acid by a couple different methods. different methods. Witness the awesome power of a buffer Witness the awesome power of a buffer solution to resist changes in pH. solution to resist changes in pH.
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2 © 2003 By Default! A Free sample background from www.awesomebackgrounds.com Slide 4 Non Non­ Equilibrium Reaction Equilibrium Reaction Reaction goes to completion. Reaction goes to completion. HCl H + + Cl KNO KNO 3 K + + NO + NO 3 CH CH 4 + 2O + 2O 2 CO CO 2 + 2H + 2H 2 O © 2003 By Default! A Free sample background from www.awesomebackgrounds.com Slide 5 Equilibrium Reaction Equilibrium Reaction Products react with each other to re to re­ form the reactants. form the reactants. PbSO PbSO 4 Pb Pb 2+ 2+ + SO 4 2 CH 3 COOH CH 3 COO + H + N 2 (g) + 3H + 3H 2 (g) 2 NH 2 NH 3 (g) (g) © 2003 By Default! A Free sample background from www.awesomebackgrounds.com Slide 6 Equilibrium Expression Equilibrium Expression K a = [H + ][A ] [HA] For any equilibrium reaction, aA aA + bB cC cC + dD For a weak acid dissociation, HA H HA H + + A K eq = [C] [C] c [D] [D] d [A] a [B] b products reactants
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3 © 2003 By Default! A Free sample background from www.awesomebackgrounds.com Slide 7 Strong Acids Strong Acids H 2 SO 4 HNO 3 HCl HBr HClO 3 HClO HClO 4 HI Weak Acids All the rest! All the rest! CH 3 COOH R COOH H 3 PO PO 4 HF NH HF NH 4 + “HA” © 2003 By Default!
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