A few useful links

Just a few quick links, hopefully they help

https://www.khanacademy.org/science/chemistry/acids-and-bases-topic

http://www.chemguide.co.uk/physical/acidbaseeqia/theories.html

http://www.visionlearning.com/en/library/Chemistry/1/Acids-and-Bases/58

https://www.brainpop.com/science/matterandchemistry/acidsandbases/

http://lrs.ed.uiuc.edu/students/erlinger/water/background/ph.html