Propionic acid, HC3H5O2, has Ka= 1.34 x 10–5. (a) What is the molar concentration of H3O+ in 0.15 M HC3H5O2 and the pH of the solution? (b) What is the Kb value for the propionate ion, C3H5O2–? (c) Calculate the pH of 0.15 M solution of sodium propionate, NaC3H5O2. (d) Calculate the pH of solution that contains 0.12 M HC3H5O2 and 0.25 M NaC3H5O2

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter14: Acids And Bases
Section: Chapter Questions
Problem 30QRT
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Propionic acid, HC3H5O2, has Ka= 1.34 x 10–5.

(a) What is the molar concentration of H3O+ in 0.15 M HC3H5O2 and the pH of the solution?

(b) What is the Kb value for the propionate ion, C3H5O2?

(c) Calculate the pH of 0.15 M solution of sodium propionate, NaC3H5O2.

(d) Calculate the pH of solution that contains 0.12 M HC3H5O2 and 0.25 M NaC3H5O2.

Expert Solution
Step 1

HC3H5Ois a weak acid and dissociates in aqueous solution as:

HC3H5O2+H2OC3H5O2-+H3O+

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