Question

Titrate the base trimethylamine (TMA) with 0.126 M HCl.

(CH3)3N(aq)+H2O(l)-->(CH3)3NH+OH Kb=6.45×10^5

There are .00615 moles of (TMA) in 42.5 mL H20 befor titration begins


a) write the Kb expression for TMA?

b) what is the pKb value?

c)what is the initial concentration of TMA in H20?

d) what is pH of the TMA solution before titration has begun?

e)what percent of TMA is in the protonated from at the beginning of the titration?

f) what volume HCl must be added to reach midpoint of the titration?

g) what is the total volume of buffer region?

h)what is the total volume of HCl added at the equivalence point?

I) what is the pH at the equivalence point?

Answer 1

The coefficient is 2 / 3 = 0.666