Weakly acidic salt methylammonium chloride (CH₃NH₃Cl) pH problem

00:07 0.250 M methylammonium chloride
01:22 Lewis structure of ammonia
02:10 Lewis structure of methylamine
02:53 Dissociation of methylammonium chloride
04:08 Acidity of methylammonium ion
05:35 Kb of methylamine
06:55 Calculation of Ka for conjugate acid
09:40 Ka expression
10:34 Let x = [H+]
11:45 Assume x ≪ 0.0250 M
12:35 Substitute into Ka expression
13:14 Solve for x
15:25 Calculate pH
Calculation of the pH of an aqueous solution of the salt of a weak base and strong acid (methylammonium chloride), so it has weakly acidic properties.
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(For *mobile* users) 00:07 0.250 M methylammonium chloride 01:22 Lewis structure of ammonia 02:10 Lewis structure of methylamine 02:53 Dissociation of methylammonium chloride 04:08 Acidity of methylammonium ion 05:35 Kb of methylamine 06:55 Calculation of Ka for conjugate acid 09:40 Ka expression 10:34 Let x = [H+] 11:45 Assume x ≪ 0.0250 M 12:35 Substitute into Ka expression 13:14 Solve for x 15:25 Calculate pH