Friday
April 18, 2014

Homework Help: Analytical Chemistry

Posted by Sam on Wednesday, February 27, 2013 at 11:45am.

Calculate the pH at the equivalence point for the titration of 0.160 M methylamine (CH3NH2) with 0.160 M HCl. The Kb of methylamine is 5.0 104.

Methylamine is a weak base and reacts with HCl to give the methylammonium ion.

HCl + CH3NH2 <---> CH3NH3^+ + Cl^-
0.160M 0.160M 0 0
-x -x +x +x
0.160-x 0.160-x x x

kb= x^2/(0.160-x)(0.160-x)

Have I set up the ice chart correctly? I'm not sure.

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