A 0.100 M HNO3 solution is used to titrate 50.0 mL of 0.100 M trimethylamine ((CH3)3N, Kb = 7.4 x 10^-5). Identify the type of solution indicated for the following points in the titration and calculate the resulting pH.
a. When 50.2 mL of titrant are added.
b. When 40 mL of titrant are added.
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