pH-”pouvoir hydrogine” The Power of Hydrogen

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

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

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

The Scale Numbers on the scale Lower #s on the scale mean higher H+ conc. pH 1 = 10-1 = .1 H+ pH 2 + 10 -2 = .01 H+ Increments on the scale (H+) + (OH-) = 10-14

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