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)

Which of the following combinations would be the best to buffer the pH of a solution at approximately 7? A Na3PO4 and Na₂HPO4 (Ka= 4.810-13) B KCN and HCN (Ka= 6.1710-10) H3PO4 and NaH2PO4 (Ka= 7.5210-3) Na₂HPO4 and NaH2PO4 (Ka= 6.23108)

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

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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