Acids and Bases Arrhenius Bronsted-Lowry Lewis. Definitions of Acids/Bases.

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Presentation transcript:

Acids and Bases Arrhenius Bronsted-Lowry Lewis

Definitions of Acids/Bases

Measuring Acid Strength Ka

Acid Strength defined by pK a

Dissociation in H 2 O Arrhenius Acid forms H 3 O + Bronsted-Lowry Acid donates a H +

Resonance Stabilization

Stronger Acid Controls Equilibrium

Reaction Described with Arrows HCl donates a proton H 2 O accepts a proton

Equilibrium Reactions

Draw the Conjugate Acid and Base

Propanol is a Base

Draw the Conjugate Acid and Base

Propanol is an Acid

Some Acid-Base Reactions

The Effect of Resonance on pKa

Identify the Acid and Base

Equilibrium Favors Reactants

Carboxylic Acids can be Separated from non-acidic Compounds

Lewis Acids and Bases

Formation of a new bond

Lewis Base = Nucleophile Lewis Acid = Electrophile

Draw the Acid-Base Complexes

Draw Arrows

Identify the Conjugate Base (i.e. Which H is most acidic?)

By deprotonating one of the H b protons, one can distribute the charge onto three atoms and give a major resonance structure with the charge on the Oxygen (the third structure).