1. pH-”pouvoir hydrogine” The Power of Hydrogen

2. Dissociation of Water Molecules
In a pure sol’n of water, sometimes the H of one water molecule is attracted to the O of a second molecule
dynamic equilibrium

3. Acids & Bases
Other substances added to water can affect the concentrations of H+ (& OH-)
If HCl is added:

4. If a base(NaOH) is added to water:
IOW, acids add H+ to a sol’n, bases remove H+ from a sol’n

5. The Scale Numbers on the scale
Lower #s on the scale mean higher H+ conc.
pH 1 = 10-1 = .1 H+
pH = .01 H+
Increments on the scale
(H+) + (OH-) = 10-14

6. H2CO3 ® H+ + HCO3 Exist in 2 different forms Regulate pH Carbonic acid
Buffers
Exist in 2 different forms
Regulate pH
Carbonic acid
Acidosis vs alkalosis
H2CO3 ® H+ + HCO3