Lecture 10 - Acid-Base Strength The general trend Inductive...

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1 Chem 172 Advanced Inorganic Chemistry Lecture 10 Acid-Base and Donor Acceptor Chsmitry Arrhenius Concept (1890s) Arrhenius acids form hydrogen ions in aqueous solution; Arrhenius bases form hydroxide ions in aqueous solution. Bronsted-Lowry Concept (1923) Acids: species with a tendency to lose a hydrogen ions; Bases: species with a tendency to gain a hydrogen ions. Solvent-System Concept The solvent system concept appies to any solvent that can dissocaite into a action (acid) and a an anion (base). Acid: Solute that can increase the concentration of cation; Base: Solute that can increase the conctration of anion. Lewis Concept Acid: electron pair acceptor; Base: electron pair donor. Frontier Orbital Description of Lewis Concept Even with proper orbital symmetry, a single species can act as an oxidizing agent, an acid, a base and a reducing agent depending on the energy level the other reactant. Acid-Base Strength Acid dissociation equilibrium constant: Acid-Base Strength Proton Affinity
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2 Acid-Base Strength Binary hydrogen compound
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Unformatted text preview: Acid-Base Strength The general trend: Inductive effect Acid-Base Strength Steric effect: Acid-Base Strength Steric effect: Acid-Base Strength Solvation Effect: Acid-Base Strength The Acidity of Cations in Aqueous Solution 3 Acid-Base Strength Leveling Effect Acid-Base Strength Leveling Effect Theory and Hard and Soft Acid and Bases By Pearson, 1963 Hard: non-Ploarizable Soft: polarizable Hard acid prefers to bind to hard bases, and soft acid prefers to bind to soft bases. Theory and Hard and Soft Acid and Bases Theory and Hard and Soft Acid and Bases Theory and Hard and Soft Acid and Bases 4 Theory and Hard and Soft Acid and Bases Quantitative measures: Absolute hardness = half the difference between the ionization energy and the electron affinity. Soft ness is defined as the inverse of hardness. Theory and Hard and Soft Acid and Bases Midterm Apr 23 Simple bonding theory and molecular bonding theory MT: Lecture & Chapter 3 and 5...
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This note was uploaded on 06/27/2010 for the course CHEMISTRY Chem 172 taught by Professor Duan,x. during the Spring '10 term at UCLA.

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Lecture 10 - Acid-Base Strength The general trend Inductive...

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