Answered: dissolving 1.22 grams benzoic acid (pKa…

dissolving 1.22 grams benzoic acid (pKa = 4.20, Molar Mass, μ = 122 g/mol) and 2.88 grams sodium benzoate (Molar Mass, μ = 144 g/mol) in an appropriate amount of water.

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter14: Acid- Base Equilibria

Section: Chapter Questions

Problem 4RQ: A good buffer generally contains relatively equal concentrations of weak acid and conjugate base. If...

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Question

A 100.00 mL buffer is prepared by dissolving 1.22 grams benzoic acid (pKa = 4.20, Molar Mass, μ = 122 g/mol) and 2.88 grams sodium benzoate (Molar Mass, μ = 144 g/mol) in an appropriate amount of water.

i. What is the pH of the solution if 10.0 mL of 0.250 M HCl is added?

a. 6.35

b. 4.20

c. 9.65

d. 4.35

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