American Geosciences Institute
American Geosciences Institute: Earth Science Week: Rock Pop
Students investigate the process of rock being eaten away by acid, thus releasing carbon dioxide into the air.
Chem4kids
Chem4 Kids: Acids & Bases
This Chem4Kids site provides a general overview of acids and bases, and their use in chemistry. Content focuses on "names to know" and how acids and bases work.
Chem Tutor
Chem Tutor: Chemistry: Titration and P H Math Problems
This is a titration and ph math problem exercise; the answers are also provided.
Chem Tutor
Chemtutor: Weak Acids and Bases
For high school or college chemistry students. Discusses the use of dissociation constants to determine strength of an acid or base.
Shodor Education Foundation
Shodor: Acid Base Chemistry
This Shodor Education Foundation page has a nice look at the major theories of acids and bases in less than one page. There are very simple defintions.
Purdue University
Purdue University: Calcium Hydroxide Crystal Structure
A picture of the crystal structure of calcium hydroxide. Additional plug-in required.