Chemistry LibreTexts - Overview of Acids and Bases
Excellent run-down of the Arrhenius, Lewis, and Brønsted definition of acids and bases.
Purdue University - Definitions of Acids and Bases and the Role of WaterGood, comprehensive tutorial on the different chemical perspectives on acids and bases.
Purdue University - The Arrhenius Definition of Acids and BasesCoherent, well-illustrated characterization of Arrhenius acids and bases.
Purdue University - The Brønsted Definition of Acids and BasesExcellent introduction to the brønsted-Lowery definition of acids and bases.
Purdue University - Brønsted Acids and BasesExtended treatment of Brønsted-Lowry acid-base theory. Good introduction to the concept of pH.
Purdue University - Transition-Metal Ions as Brønsted AcidsInteresting side-topic. This kind of thing would make a good curve-ball passage on the MCAT.
Purdue University - The Lewis Definitions of Acids and BasesClear, well-illustrated introduction.
Topic Resources
20 questions
figures for classroom presentation