Titrate the base trimethylamine (TMA) with 0.100 M HCl.?

Question

Titrate the base trimethylamine (TMA) with 0.100 M HCl.
(CH3)3N(aq) + H2O(l) (CH3)3NH+(aq) + OH-(aq) Kb = 6.45 x 10-5
There are 0.00615 moles of TMA in 42.5 mL H2O before titration begins.
a) Write the Kb expression for TMA.
b) What is the pKb value?
c) What is the initial concentration of TMA in water?
[TMA]initial = [TMA] + [TMAH+]
d) What is the pH of the TMA solution before the titration has begun?
e) What percent of TMA is in the protonated form at the beginning of the titration?
f) What is the Henderson-Hasselbach equation for a base?
g) What volume of HCl must be added to reach the midpoint of the titration?
h) What is the total volume of the buffer region?
i) What is the total volume of HCl added at the equivalence point?
j) What is the pH at the equivalence point?
k) What is the pH at 0.1 mL past the equivalence point? Titrate the base trimethylamine (TMA) with 0.100 M HCl.
(CH3)3N(aq) + H2O(l) (CH3)3NH+(aq) + OH-(aq) Kb = 6.45 x 10-5
There are 0.00615 moles of TMA in 42.5 mL H2O before titration begins.
a) Write the Kb expression for TMA.
b) What is the pKb value?
c) What is the initial concentration of TMA in water?
[TMA]initial = [TMA] + [TMAH+]
d) What is the pH of the TMA solution before the titration has begun?
e) What percent of TMA is in the protonated form at the beginning of the titration?
f) What is the Henderson-Hasselbach equation for a base?
g) What volume of HCl must be added to reach the midpoint of the titration?
h) What is the total volume of the buffer region?
i) What is the total volume of HCl added at the equivalence point?
j) What is the pH at the equivalence point?
k) What is the pH at 0.1 mL past the equivalence point?

Explanation / Answer

correct on the Kb and the pKb

initial conc is simply 0.0068 mol / 0.0425 L

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