This unit is getting a refresh in Spring 2026. The goal is to move all homework problems to 2014+.
In this unit, we continue our dive into one of the most heavily tested topics on the AP Chemistry exam, chemical equilibrium. Topics from chapters 14, 15, and 16 can comprise anywhere from 18-24% of the multiple-choice questions and an equal or greater significance on the free-response section. This is the section that helps students boost their 3s into 4s and 5s!
Notes: The Common Ion Effect and Buffer Definition, Filled Out
Worksheets:
Notes: Writing Acid-Base Reactions, filled out
Worksheet: Writing Acid-Base Reactions with Buffer Solutions, Answers
Notes: Protonation States and Acid-Base Indicators, filled out
Worksheets:
AP Problem Buffers PE 2013#7, Answers
Note: Do a full multiple-choice practice test over the nearest weekend. It's time to review.
Class Notes: Titrating a Weak Acid with a Strong Base, Filled Out
Worksheet:
AP Classroom Problem Set: HW Acid-Base Titrations
Notes: Weak-Base Strong Acid Titrations, filled out
Homework:
Prepare for the lab with this Lab Handout.
CollegeBoard version of this lab (intense but a helpful document)
Worksheets for Lab Report Writing Day:
Note: This chapter is not done. Next we go to solubility equilibria!
The following materials were used prior to the 2025-2026 school year. They aren't bad, but the styles of AP questions have shifted and the homework practice needed to be adjusted.
Notes: The Common Ion Effect and Buffer Definition, Filled Out
Worksheets:
Notes: Disturbing Equilibrium with a Strong Base or Acid, Filled Out (Calculations modified in newer notes to better match requirements for the AP exam. These older notes are still solid for college classes.)
Worksheet:
Writing Acid-Base Reactions with Buffer Solutions, Answers
Disturbing Equilibrium Calculations, Answers (No longer explicitly tested on the AP exam outside of titration problems)
Buffer Equilibria 1991, Answers (Part d no longer explicitly tested on the AP exam outside of titration problems)
Handout: The Target Lab
Class Notes: Titrating a Weak Acid with a Strong Base, Filled Out
LAB Handout: Determining the Ka of a Weak Acid
Worksheets:
AP Problem 2012 #1, Answers
AP Problem 2012 form B #1, Answers
Notes: Base Titrations and Acid-Base Indicators
LAB Handout: Determining the Kb of a Weak Base
Worksheets
Titrations 2014 #2, Answers (note needs to be made)
These videos were made a very long time ago and the sound quality is questionable.