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Dimethylamine, (CH3)2NH, is an organic base with pKb= 3.23at 298 K. In an experiment, a 40.0...

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Chemistry

Dimethylamine, (CH3)2NH, is an organic base with pKb= 3.23at 298K. In an experiment, a 40.0 mL sample of 0.105mol/L-1(CH3)2NH(aq)istitrated with 0.150mol/L-11HI(aq)at 298 K.

(a) Write a balanced chemical equation for the neutralizationreaction upon which this titration is based, and indicate clearlywhich atom is being protonated. Then, calculate the equilibriumconstant for the neutralization reaction. (Hint: To calculate theequilibrium constant, you may find it helpful to represent theneutralization reaction as the sum of twoor morereactions.)

(b) Calculate the pH, [(CH3)2NH], and[(CH3)2NH2+] at thefollowing stages of the titration. Justify any approximations.

i) before the addition of any HI solution

ii) after the addition of 20.0 mL of HI solution

iii) at the equivalence point

iv) after the addition of 60.0 mL of HI solution

Answer & Explanation Solved by verified expert
4.5 Ratings (928 Votes)
CH32NHaq HIaq CH32NH2aq Iaq kb of CH32NH 10kb 10323 kb 59104 b i before the addition of any HI solution pH of CH32NH    See Answer
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