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Chemistry II – AP
Chapter 16 – Acid-Base Equilibria
Test format
12 multiple choice (2 points each)
5 multiple choice (4 points each)
1 problem (from an AP Chemistry Exam, 10 points)
TEST – Thursday, March 5, 2009
(54 points total)
Multiple Choice (2 pointers) topics:
 Acid-Base definitions
o Arrhenius (yield H+/OH- in solution)
o Bronsted-Lowry (proton donor/acceptor)
 Also conjugate a-b pairs
o Lewis (electron pair acceptor/donor)
 pH
o simple pH calculations from [H3O+] or [OH-]
o log scale; so a change of 2 units on the pH scale translates to change of __ in [H3O+]
o pH + pOH = 14 (based on the equation [H3O+] x [OH-] = Kw (1.0  1014)
 Weak acids and bases
o Equations that show their interaction with water
o Ka and Kb expressions
o Strength of as indicated by their Ka or Kb values
o Kw = Ka x Kb
 Hydrolysis of salts
o Predict if the salt is acidic, basic, or neutral
o Calculate the pH, or [H3O+], or [OH-], …
o How metal ions in solution are acidic (see p.708)
 Strength of acids as related to structure
o Polarity of bond, strength of bond, stability of conjugate base
o Oxyacids
 Greater EN; more acidic
 More oxygens; more acidic
Multiple Choice (4 pointers) topics:
 Weak acid, Weak base problems; typically solve for
o Ka, or Kb
o pH, (sometimes pOH, but not very often)
o [H3O+], or [OH-]
o Percent dissociation
o Initial concentration of the weak acid or base
Free Response problem (from a past AP Chemistry Exam)
 Usually five or more parts, including, but not limited to…
o Writing an equation showing reaction of an acid or base with water
o Ka, Kb expression
o ICEbox solution to a problem (solve for [H3O+], [OH-], pH, …)
o Other…