Show your all calculation The compound dimethylamine is a weak base like ammonia. A solution contains 0.316 M (CH),NH,* and 0.117 Mdimethylamine, (CH3),NH.The pH of this solution isSubmit AnswerRetry Entire Group9 more group attempts remaining

The given solution is a buffer mixture of weak base dimethylamine, (CH3)2NH and conjugate acid…

Answered: The compound dimethylamine is a weak…

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 36P

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Show your all calculation

The compound dimethylamine is a weak base like ammonia. A solution contains 0.316 M (CH),NH,* and 0.117 M
dimethylamine, (CH3),NH.
The pH of this solution is
Submit Answer
Retry Entire Group
9 more group attempts remaining

Expert Solution

Step 1

The given solution is a buffer mixture of weak base dimethylamine, (CH₃)₂NH and conjugate acid (CH₃)₂NH₂⁺. Thus, we can use Henderson - Hasselbalch equation to calculate the pOH and subsequently the pH of the solution. It is given by,

We know that, K_b for (CH₃)₂NH = 5.40 x 10^-4

Thus, pK_b= -log K_b= - log( 5.40 x 10^-4) = 3.27

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