lecture_4legge - 8/24/2009 Acids and Bases 9 / 03 / 2009...

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8/24/2009 1 Acids and Bases 9 / 03 / 2009 Chapter 2 Water 1. How is the molecular structure of water related to physical and chemical behavior? 2. What is a Hydrogen Bond? 3. What are Acids and Bases? 4. What is pH, and what does it have to do with the properties of Water? 5. What are Titration Curves? 6. What are buffers, and why they are important? Ionization of water • Neutral water has a tendency to ionize H 2 OH + + OH - • The free proton is associated with a water molecule to form the hydronium ion H 3 O + Proton Jumping Large proton and hydroxide mobility •H 3 O+ : 362.4 x 10 -5 cm 2 •V -1 •s -1 •N a + : 51.9 x 10 -5 cm 2 •V -1 •s -1 • Hydronium ion migration; hops by switching partners at 10 12 per second Equilibrium expression • Described by: K = [H + ] [OH - ] [H O + + OH H O H 2 Where K is the dissociation constant • Considering [H 2 O] constant yields K w = [H + ][OH - ] [H 2 O] K w K w = [H + ][OH - ] • Where K w is the ionization constant of water • For pure water ionization constant is 10 -14 M 2 at 25º • For pure water [H + ] = [OH - ] = ( K w ) 1/2 = 10 -7 M Acids and bases • For pure water (neutral) [H + ] = [OH - ] = ( K w ) 1/2 = 10 -7 M • Acidic if [H + ] > 10 -7 M • Basic if [H + ] < 10 -7 M
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8/24/2009 2 Acids and Bases Lowery definition: Acid is a substance that can donate a proton . Base is a substance that can accept a proton.
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This note was uploaded on 02/22/2011 for the course BCHS 3304 taught by Professor Johnson during the Spring '08 term at University of Houston.

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lecture_4legge - 8/24/2009 Acids and Bases 9 / 03 / 2009...

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