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4. Acid dissociation constants for phosphoric acid are given below:   Ka1 Ka2 Ka3 H3PO4 7.5 ×10–3 6.2 ×10–8 4.8 ×10–13   A buffer with a pH = 7.45 can best be made by using     a H3PO4 and H2PO4-   b Only H2PO4-   c H2PO4- and HPO42-   d Only HPO42-   e HPO42- and PO43-

4. Acid dissociation constants for phosphoric acid are given below:   Ka1 Ka2 Ka3 H3PO4 7.5 ×10–3 6.2 ×10–8 4.8 ×10–13   A buffer with a pH = 7.45 can best be made by using     a H3PO4 and H2PO4-   b Only H2PO4-   c H2PO4- and HPO42-   d Only HPO42-   e HPO42- and PO43-

Chemistry
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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4. Acid dissociation constants for phosphoric acid are given below:

 

Ka1

Ka2

Ka3

H3PO4

7.5 ×10–3

6.2 ×10–8

4.8 ×10–13

 

A buffer with a pH = 7.45 can best be made by using

 

  a

H3PO4 and H2PO4-
  b

Only H2PO4-
  c

H2PO4- and HPO42-
  d

Only HPO42-
  e

HPO42- and PO43-
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