Chad's GC missing steps

When taking some of chad's quizzes, I sometimes find myself trying to remember back to my Gen chem courses to get through. For example, he did not talk about Ka or PKa, yet they showed up on his quiz. Am I missing some resource that is commonly used, or does some of his material assume that you already know this? (video 5.05)
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums