1. University of Akron pH Page~ this page gives a great refresher for acids, bases, and salts. This page describes strengths and properties of acids and bases, background information on pH, and directions on how to perform efficient titration.

http://ull.chemistry.uakron.edu/genobc/Chapter_09/

2. pH Fact Sheet~ this site describes what pH measures and provides ecologically relevant information on pH in waterways.

http://ilpi.com/msds/ref/ph.html

3. pH Fact Sheet~ this site from Kids in the Creek describes what environmental factors affect pH readings, how to test for pH, and what consequences pH has to aquatic organisms.

http://www.bpa.gov/Corporate/KR/ed/kidsinthecreek/topics/waterquality/ph.htm