pH-
Measures how acidic or basic a substance is. The rage goes from 0 to 14. If the number is 7, it is neutral. If it is from 0 to seven it is acidic. If it is from 7 and above then it is basic.
http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/ph.html
http://www.elmhurst.edu/~chm/vchembook/184ph.html
http://www.epa.gov/acidrain/measure/ph.html
http://water.usgs.gov/edu/phdiagram.html
http://it.wikipedia.org/wiki/PH
http://en.wikipedia.org/wiki/PH
http://www.youtube.com/watch?v=Xeuyc55LqiY
http://www.whatisph.com/
http://www.esf.edu/pubprog/brochure/soilph/soilph.htm
http://phet.colorado.edu/en/simulation/ph-scale
Acids-
Something is considered an acid when it releases protons or hydrogen ions.
http://en.wikipedia.org/wiki/Acid
http://www.elmhurst.edu/~chm/vchembook/181acids.html
http://www.chem4kids.com/files/react_acidbase.html
http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/acid.html
http://www.chemtutor.com/acid.htm
http://nar.oxfordjournals.org/
http://www.biology.arizona.edu/biochemistry/problem_sets/aa/aa.html
http://www.visionlearning.com/en/library/Chemistry/1/Acids-and-Bases/58
http://link.springer.com/journal/726
http://www.chemteam.info/Nomenclature/Acid-Nomenclature.html
Bases-
Something considered a base is something that can donate a hydroxide ion. It also is something that accepts Hydrogen ions.
http://www.chemtutor.com/acid.htm#what
en.wikipedia.org/wiki/Base_(chemistry)
simple.wikipedia.org/wiki/Base_(chemistry)
http://www.britannica.com/EBchecked/topic/54697/base
https://www.khanacademy.org/science/chemistry/acids-and-bases
http://www.factmonster.com/cig/chemistry/what-acids-bases.html
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/ions/acidsbasesrev1.shtml
http://www.uiowa.edu/~chemrev/chem-basic/acid_base.htm