Page 39 - Analytical Chemistry I E-book
P. 39
pH of Acids and Bases
pH of strong Acids:
Strong acids are assumed to be completely dissociated
i.e., the concentration of the acid represents concentration of [H+].
pH= - log [H+]
EX: Calculate pH of 0.1M HCl
[H+]=1/10 = 10-1 pH= -log 10-1=1
pH of strong Bases:
Strong bases are assumed to be completely dissociated
i.e., the concentration of the base represents concentration of [OH-].
pH= 14 - pOH (-log [OH-])
EX: Calculate pH of 0.1M NaOH
[OH-]=1/10 = 10-1 pOH= -log 10-1 = 1
So that pH = 14 - 1 = 13.
