21.Acetic acid has a pKa of 4.8. How many milliliters of 0.2 M acetic acid and 0.1 sodium acetate are required to prepare 1 liter of 0.1 M buffer solution having a pH of 4.8? A. 500 ml acetic acid and 500 ml sodium acetate B. 250 ml acetic acid and 250 ml sodium acetate, then 500 ml water C. 250 ml acetic acid and 500 ml sodium acetate, then 250 ml water D. 500 ml acetic acid and 250 ml sodium acetate, then 250 ml water E. None of the above 22. The pKa value of phosphoric acid are 2.2, 7.2 and 12.7. A phosphate buffer of pH = 7.4 can be prepared using A. H₂PO4 and HPO4²- B. HPO42 and PO4³- C. H3PO4 and HCI D. None of the above

21.Acetic acid has a pKa of 4.8. How many milliliters of 0.2 M acetic acid and 0.1 sodium acetate are required to prepare 1 liter of 0.1 M buffer solution having a pH of 4.8? A. 500 ml acetic acid and 500 ml sodium acetate B. 250 ml acetic acid and 250 ml sodium acetate, then 500 ml water C. 250 ml acetic acid and 500 ml sodium acetate, then 250 ml water D. 500 ml acetic acid and 250 ml sodium acetate, then 250 ml water E. None of the above 22. The pKa value of phosphoric acid are 2.2, 7.2 and 12.7. A phosphate buffer of pH = 7.4 can be prepared using A. H₂PO4 and HPO4²- B. HPO42 and PO4³- C. H3PO4 and HCI D. None of the above

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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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

21.Acetic acid has a pKa of 4.8. How many milliliters of 0.2 M acetic acid and 0.1 sodium
acetate are required to prepare 1 liter of 0.1 M buffer solution having a pH of 4.8?
A. 500 ml acetic acid and 500 ml sodium acetate
B. 250 ml acetic acid and 250 ml sodium acetate, then 500 ml water
C. 250 ml acetic acid and 500 ml sodium acetate, then 250 ml water
D. 500 ml acetic acid and 250 ml sodium acetate, then 250 ml water
E. None of the above
22. The pKa value of phosphoric acid are 2.2, 7.2 and 12.7. A phosphate buffer of pH = 7.4 can
be prepared using
2-
A. H₂PO4 and HPO4²
3-
B. HPO4² and PO4³-
C. H3PO4 and HCI
D. None of the above

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