Using the table of the weak base below, you have chosen Methylamine as your weak base in the buffer solution. You have already added enough of the conjugate acid salt to make the buffer solution concentration at 0.48 M in this salt. The desired pH of the buffer should be equal to 9.75. Values of K, for Some Common Weak Bases Conjugate Acid Name Formula Kb Ammonia NH3 NH4+ 1.8 x 10-5 CH;NH,* 4.38 x 10-4 Methylamine CHẠNH, Ethylamine C₂H5NH₂ C₂H5NH3+ 5.6 x 10-4 Aniline CH;NH, CH;NH;* 3.8 x 10-10 Pyridine C5H5N CH;NH* 1.7 x 10-⁹ 1. Compute the poH of the buffer solution. (answer in 2 decimal places)

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 55P
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Using the table of the weak base below, you have chosen Methylamine as your weak base in the buffer solution. You have already added enough of the
conjugate acid salt to make the buffer solution concentration at 0.48 M in this salt. The desired pH of the buffer should be equal to 9.75.
Values of K, for Some Common Weak Bases
Conjugate
Acid
Name
Formula
Kb
NH4+
1.8 x 10-5
Ammonia
Methylamine
NH3
CH;NH,
CH3NH3 +
4.38 x 10-4
C₂H5NH₂
C₂H5NH3 +
5.6 x 10-4
Ethylamine
Aniline
CH;NH,
C6H5NH3 +
3.8 x 10-10
Pyridine
C,H,N
CşH;NH+
1.7 x 10-⁹
1. Compute the poH of the buffer solution. (answer in 2 decimal places)
Transcribed Image Text:Using the table of the weak base below, you have chosen Methylamine as your weak base in the buffer solution. You have already added enough of the conjugate acid salt to make the buffer solution concentration at 0.48 M in this salt. The desired pH of the buffer should be equal to 9.75. Values of K, for Some Common Weak Bases Conjugate Acid Name Formula Kb NH4+ 1.8 x 10-5 Ammonia Methylamine NH3 CH;NH, CH3NH3 + 4.38 x 10-4 C₂H5NH₂ C₂H5NH3 + 5.6 x 10-4 Ethylamine Aniline CH;NH, C6H5NH3 + 3.8 x 10-10 Pyridine C,H,N CşH;NH+ 1.7 x 10-⁹ 1. Compute the poH of the buffer solution. (answer in 2 decimal places)
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