http://mccord.cm.utexas.edu/courses/summer2005/ch302/strong.html
http://www.science.uwaterloo.ca/~cchieh/cact/c123/wkacids.html
http://www.factmonster.com/cig/chemistry/properties-acids-bases.html
https://sites.google.com/site/svantearrheniustheory/comparison-between-arrhenius-and-lowry
http://www.chemteam.info/AcidBase/Strong-Weak-AcidBase.html
http://www.800mainstreet.com/acid_base/definitions-ph.html
http://chemistry.about.com/od/acidsbase1/a/buffers.htm
http://www.ducksters.com/science/acids_and_bases.php