MB.1.2. Ph scale (HSC biology)
Channel: Letslearnscience
Date: 10/01/2012

Covers the HSC biology syllabus dot point: "identify the pH as a way of describing the acidity of a substance"

• Measure of relative acidity of a substance, the hydronium ion concentration in solution. Enzymes need an optimum pH for their functioning.
• Stomach -- very acidic due to presence of HCl. pepsin works best at around pH of 2 -- 3 
• Small intestine -- slightly basic pH rage of 7 -- 8. Trypsin works very well under these conditions
• pH of our blood needs to be finely controlled -- at 7.35 pH
-       if low acidosis
- if high alkalosis 

Maintaining a balance module playlist:
http://www.youtube.com/playlist?list=PL8C9FB38DABFE8322

Blueprint of life module playlist:
http://www.youtube.com/playlist?list=PLC1B7EEA2D9BE7FAC