Consider the list of acids and their pKa values to the right.What two compounds would be best to use in preparing a pH 9.0 buffer solution? Justify your answer. Assume you have the acids and the sodium salts of their conjugate bases available to you. pKaAcidpK.HС-Н,0, 4.76НС-Н,0, 4.20HCIO, 1.92НСНО, 3.74HCN 9.40aceticbenzoicchlorousformichydrocyanichydrofluorichypochlorousmonochloroacetic HC,H,CIO, 2.87HF 3.17НОСI 7.53HNO, 3.29НОССН, 9.80nitrousphenol

Buffers are effective when the pKa values are closest to pH.

pKa Acid pK. HС-Н,0, 4.76 НС-Н,0, 4.20 HCIO, 1.92 НСНО, 3.74 HCN 9.40 acetic benzoic chlorous formic hydrocyanic hydrofluoric hypochlorous monochloroacetic HC,H,CIO, 2.87 HF 3.17 НОСI 7.53 HNO, 3.29 НОССН, 9.80 nitrous phenol

pKa Acid pK. HС-Н,0, 4.76 НС-Н,0, 4.20 HCIO, 1.92 НСНО, 3.74 HCN 9.40 acetic benzoic chlorous formic hydrocyanic hydrofluoric hypochlorous monochloroacetic HC,H,CIO, 2.87 HF 3.17 НОСI 7.53 HNO, 3.29 НОССН, 9.80 nitrous phenol

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

Chapter3: Atomic Shells And Classical Models Of Chemical Bonding

Section: Chapter Questions

Problem 75P

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Question

Consider the list of acids and their pKa values to the right.

What two compounds would be best to use in preparing a pH 9.0 buffer solution? Justify your answer. Assume you have the acids and the sodium salts of their conjugate bases available to you.

pKa
Acid
pK.
HС-Н,0, 4.76
НС-Н,0, 4.20
HCIO, 1.92
НСНО, 3.74
HCN 9.40
acetic
benzoic
chlorous
formic
hydrocyanic
hydrofluoric
hypochlorous
monochloroacetic HC,H,CIO, 2.87
HF 3.17
НОСI 7.53
HNO, 3.29
НОССН, 9.80
nitrous
phenol

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