Trimethylamine, (CH3)3N, is a weak base with pKs = 4.19 at 25°C. A 25.00 mL sample of an aqueous solution of trimethylamine is

Question

Trimethylamine, (CH3)3N, is a weak base with pKs = 4.19 at 25°C. A 25.00 mL sample of an aqueous solution
of trimethylamine is titrated with 0.125 MHCI. The neutralization reaction is as follows:
(CH3)3N(aq) + HCl(aq) → (CH3)3NH+(aq) + Cl-(aq)
The equivalence point of the titration is reached after the addition of 20.38 mL of HCl solution.
(a) What is the concentration of the trimethylamine solution?
(b) What is the pH of the solution at the equivalence point?

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