Which of the following combinations would be the best to buffer the pH of a solution at approximately 7? A Na3PO4 and Na₂HPO4 (Ka= 4.8*10-13) B KCN and HCN (Ka= 6.17*10-10) H3PO4 and NaH2PO4 (Ka= 7.52*10-3) Na₂HPO4 and NaH2PO4 (Ka= 6.23*108)

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 2SP: Choose a weak-acid/weak-base conjugate pair from which you could prepare a buffer solution with pH =...
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Which of the following combinations would be the best to buffer the pH of a solution at approximately 7?
A
Na3PO4 and Na₂HPO4 (Ka= 4.8*10-13)
B
KCN and HCN (Ka= 6.17*10-10)
H3PO4 and NaH2PO4 (Ka= 7.52*10-3)
Na₂HPO4 and NaH2PO4 (Ka= 6.23*108)
Transcribed Image Text:Which of the following combinations would be the best to buffer the pH of a solution at approximately 7? A Na3PO4 and Na₂HPO4 (Ka= 4.8*10-13) B KCN and HCN (Ka= 6.17*10-10) H3PO4 and NaH2PO4 (Ka= 7.52*10-3) Na₂HPO4 and NaH2PO4 (Ka= 6.23*108)
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