Chem 112-2011

Exam #3 Topics

Chapter 16

pH, pOH, [H₃O⁺], [OH^-], K_w relationships

Strong acid and strong base pH

Conjugate acid-base pairs

K_a and K_b equilibrium expressions

Relationship between magnitude of K_a and K_b for an acid-base conjugate pair

Determining K_a or K_b from a measured pH

Predicting pH of solutions of a weak acid or a weak base

Polyprotic acids: concept, not calculations

Acid-base properties of salts

Control of acid strength: bond strength and electronegativity

Chapter 17

Recognizing a buffer solution

How a buffer works

pH of a buffer solution

pH change on addition of acid or base to a buffer

Preparing a buffer with a desired pH

pH titration curves:

strong acids and bases

weak acids and bases

determining Ka from midpoint

polyprotic acids or bases

pH control of acid-base states:

alpha plots

pH indicators

Chapter 18

K_sp equilibrium expressions

Determining Ksp from solubility

Determining solubility from Ksp

Common-ion effect

Lewis acids and bases

Exam #3 Equations

pH = -log[H₃O⁺] pOH = -log[OH^-] [H₃O⁺] = 10^-pH

pK_a = -log(K_a) pH = pK_a + log([base]/[acid]) [OH^-] = 10^-pOH

You will also receive a table of weak acids and bases. You are expected to know the strong acids and bases.