Lecture 39 December 1 - Road Map • Finish and Review...

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Unformatted text preview: Road Map • Finish and Review Chapter 12: Today, 12/1 • Cover Chapter 13 (13.1-13.4): Today 12/1, Wednesday 12/3 and Friday 12/5 • FINAL EXAM: Monday December 8, 10AM-noon, room to be announced Homework Announcements • Homework on Chapter 11 due Wednesday December 3 at 11:59PM • Homework on Chapter 12 due Wednesday, December 3 at 11:59 PM • Homework on Chapter 13 due Monday, December 8 at 11:59 PM • At some temperature, the equilibrium constant for the reaction, 2H 2 O 2 (l) 2H 2 O(l) + O 2 (g) K=42. What is the equilibrium constant for the reaction, H 2 O(l) + ½ O 2 (g) H 2 O 2 (l) at this temperature? Acids and Bases • Strong acids and bases completely dissociate in solution. • Weak acids and bases only partially dissociate in solution. • A Bronsted-Lowry acid is a proton donor. • A Bronsted-Lowry base is a proton acceptor. Acids and Bases • The reaction between a weak acid or base and water is a dynamic equilibrium. • The equilibrium is composed of 2 conjugate acid-base pairs. • Conjugate acid is the acid formed when the base accepted a proton. • NH 3 is the base and NH 4 + is the conjugate acid. • The conjugate base is the base formed when the acid donated a proton. • H 2 O is the acid and OH- is the conjugate base. NH 3 (g) + H 2 O(l) ← → NH 4 + (aq) + OH- (aq) base 1 acid 2 acid 1 base 2 Weak Acids and Bases • A general equation for the dissociation of any weak acid, HA, can be written. • An equilibrium expression for the reaction can also be written. HA( aq) + H 2 O(l) ← → H 3 O + (aq) + A- (aq) [HA] ] ][A O [H = K- + 3 a Weak Acids and Bases • Larger values of K a indicate stronger acids. Weak Acids and Bases • For weak bases, an ionization equilibrium can written. • An equilibrium expression for the reaction can also be written....
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This note was uploaded on 08/29/2010 for the course CHM 2045 taught by Professor Brant during the Fall '08 term at University of South Florida.

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Lecture 39 December 1 - Road Map • Finish and Review...

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