Trimethylamine, (CH3)3N, is a weak base that ionizes in aqueous solution:
(CH3)3N(aq) + H2O(l) (CH3)3NH+(aq) + OH−(aq)
A 0.120 M solution of (CH3)3N(aq) is 2.29% ionized at 25OC.
(a) Calculate [OH− ], [(CH3)3NH+ ], [H3O+ ] and the pH for a 0.120 M (CH3)3N(aq)
solution at 25oC.
(b) Calculate Kb for (CH3)3N at 25oC.
(c) Calculate the degree of ionization, α, of a 0.096 M solution of trimethylamine. Does
the degree of ionization increase, decrease, or remain unchanged as the concentration
of (CH3)3N decreases? Give reasons for your answer.