Acids & Bases & Equilibrium. Acid- Base Strength & Dissociation Recall: Strong acids and bases dissociate quantitatively (>99.9%) in water Weak acids.

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Presentation transcript:

Acids & Bases & Equilibrium

Acid- Base Strength & Dissociation Recall: Strong acids and bases dissociate quantitatively (>99.9%) in water Weak acids and bases dissociate partially in water When a weak acid or base is added to water dynamic equilibrium is established

The Acid-Dissociation Constant, K a

Determine the K a of propanoic acid (C 2 H 5 COOH (aq) ) given that a 0.10 mol/L solution has a pH of 2.96

Determine the pH of a mol/L solution of nitrous acid (HNO 2(aq) ). K a = 5.6 X 10 -4

The Base-Ionization Constant, K b

A 5.0 g/L solution of aniline (C 6 H 5 NH 2(aq) ) has a pH of Determine the K b of aniline.

Calculate the pH of a 3.6 X mol/L solution of quinine (C 20 H 24 N 2 O 2(aq). K b = 3.3 X 10 -6

Practice Problems P. 554 #1, 2 P. 556 #3-5 P #7-10 P. 574 #12, 13

Relationship between K a, K b, & K w Worksheet (Benzoic Acid)