Answer to Question #105261 in Organic Chemistry for Anthony

Question #105261

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?

Expert's answer

The coefficient is 2 / 3 = 0.666

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Assignment Expert

25.03.20, 19:04

Dear Sarahi, Questions in this section are answered for free. We can't fulfill them all and there is no guarantee of answering certain question but we are doing our best. And if answer is published it means it was attentively checked by experts. You can try it yourself by publishing your question. Although if you have serious assignment that requires large amount of work and hence cannot be done for free you can submit it as assignment and our experts will surely assist you.

Sarahi

24.03.20, 08:46

Is from f) where did you get the 0.666? I tried to do some calculations to see where the number came from, but I do not get 0.666 and I can not see where you got it from. Thank you

Anthony J

24.03.20, 07:37

In part f where or how did you get .666?

Answer to Question #105261 in Organic Chemistry for Anthony

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