Museum of Science
The P H Factor
This is a great source of chemistry experiments and information dealing with pH. Learning objectives are provided to explain the basis for each activity. Japanese and Chinese versions are also provided.
Science is Fun
University of Wisconsin: Exploring Acids and Bases
Get a brief overview of acids, bases and pH. Explore the pH of a number of different household substances using an extract of red cabbage.
US Environmental Protection Agency
Epa: Measuring Soil P H
This site has an experiment to find out how to measure the pH of your soil. The soil pH is an important condition that can affect the health of plants and animals.