Homework SourseA 210 mL sample of 0278 M dimethylamine CH32NH is titrated w
A 21.0 mL sample of 0.278 M dimethylamine, (CH3)2NH, is titrated with 0.337 M hydrochloric acid.
The pH before the addition of any hydrochloric acid is .
Use the Tables link in the References for any equilibrium constants that are required.
Solution
initially only amine present
for weak bases
pOH = 1/2 [pKb - log C]
pKb of amine = 3.2 (standard value)
pOH = 1/2 [3.2 - log 0.278]
pOH = 1.88
pH = 14 - 1.88
pH = 12.12
