Phosphoric acid is a triprotic acid with the pKa values pKal = 2.148, pKa2 = 7.198, and pKa3 = 12.375.You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.560. To do this, you choose to mix the two salt formsinvolved in the second ionization, NaH, PO, and Na, HPO,, in a 1.000 L volumetric flask and add water to the mark. Whatmass of each salt will you add to the mixture?mass NaH, PO4gmass Na, HPO, =gWhat other combination of phosphoric acid and its salts could be mixed to prepare this buffer?

Henderson's equations enable the calculation of the pH of buffer solutions prepared by mixing known…

Answered: Phosphoric acid is a triprotic acid…

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Phosphoric acid is a triprotic acid with the pKa values pKal = 2.148, pKa2 = 7.198, and pKa3 = 12.375.

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

Phosphoric acid is a triprotic acid with the pKa values pKal = 2.148, pKa2 = 7.198, and pKa3 = 12.375.
You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.560. To do this, you choose to mix the two salt forms
involved in the second ionization, NaH, PO, and Na, HPO,, in a 1.000 L volumetric flask and add water to the mark. What
mass of each salt will you add to the mixture?
mass NaH, PO4
g
mass Na, HPO, =
g
What other combination of phosphoric acid and its salts could be mixed to prepare this buffer?

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