http://www.chem4kids.com/files/react_acidbase.html (scientific information on acids and bases)
http://www.chemtutor.com/acid.htm (lots of basic information on acids and bases)
http://www.bpa.gov/corporate/kr/ed/kidsinthecreek/topics/waterquality/ph.htm (hydrogen ions and pH)
http://www.miamisci.org/ph/ (fun kids’ site)
http://www.ec.gc.ca/acidrain/ (acid rain)
http://www.epa.gov/acidrain/ (more on acid rain)
http://chemistry.about.com/od/acidsbases/a/acidbaseformula.htm (Formulas of Common Acids & Bases)