Chapter 15 and 16 are two very important chapters. One of your free response questions will deal with acid/base equillibrium. This question alone is worth 8-10% of your total score. It is very important that you master both the qualitative and quantitative aspects of these two chapters.
Lecture 15.1a Reversible reactions Lecture 15.1b Le Chateliers Principle
Lecture 15.2a Q Lecture 15.2b Equillibrium Expressions and ICE Box Lecture 15.2c more with equillibrium expressions
Lecture 16.1 Intro to Acids and Bases
Lecture 16.2 pH calculations, equilibrium of water
Lecture 16.3 Conjugate Acid/Base calculating pH