A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M solution of NaOH. The pH of the solution was monitored throughout the titration, and the data were collected in the table below. Determine the Ka of the acid and use the data table to identify the unknown acid.
A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M solution of NaOH. The pH of the solution was monitored throughout the titration, and the data were collected in the table below. Determine the Ka of the acid and use the data table to identify the unknown acid.
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
Related questions
Question
A 125.0 mg sample of an unknown, monoprotic acid was dissolved in 100.0 mL of distilled water and titrated with a 0.050 M solution of NaOH. The pH of the solution was monitored throughout the titration, and the data were collected in the table below. Determine the Ka of the acid and use the data table to identify the unknown acid.
| volume of OH- added (mL) | pH |
| 0 | 3.09 |
| 5 | 3.65 |
| 10 | 4.10 |
| 15 | 4.50 |
| 17 | 4.55 |
| 18 | 4.71 |
| 19 | 4.94 |
| 20 | 5.11 |
| 21 | 5.37 |
| 22 | 5.93 |
| 22.2 | 6.24 |
| 22.6 | 9.91 |
| 22.8 | 10.2 |
| 23 | 10.4 |
| 24 | 10.8 |
| 25 | 11.0 |
| 30 | 11.5 |
| 40 | 11.8 |
Determine the Ka.
Use the data table below to identify the name of the unknown acid.
| Ka | pKa | |||
| acetic | 1 |
$$CH3COOH(aq)+H2O(l)H3O+(aq)+CH3COO−(aq)
|
1.76x10-5 | 4.75 |
| benzoic | 1 |
$$C6H5COOH(aq)+H2O(l)H3O+(aq)+C6H5COO−(aq)
|
6.25x10-5 | 4.20 |
| formic | 1 |
$$HCOOH(aq)+H2O(l)H3O+(aq)+HCOO−(aq)
|
1.77x10-4 | 3.75 |
| oxalic | 1 |
$$HOOCCOOH(aq)+H2O(l)H3O+(aq)+HOOCCOO−(aq)
|
5.9x10-2 | 1.23 |
| 2 |
$$HOOCCOO−(aq)+H2O(l)H3O+(aq)+−OOCCOO−(aq)
|
6.4x10-5 | 4.19 |
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 5 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Recommended textbooks for you
Chemistry: The Molecular Science
Chemistry
ISBN:
9781285199047
Author:
John W. Moore, Conrad L. Stanitski
Publisher:
Cengage Learning
General Chemistry - Standalone book (MindTap Cour…
Chemistry
ISBN:
9781305580343
Author:
Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry: The Molecular Science
Chemistry
ISBN:
9781285199047
Author:
John W. Moore, Conrad L. Stanitski
Publisher:
Cengage Learning
General Chemistry - Standalone book (MindTap Cour…
Chemistry
ISBN:
9781305580343
Author:
Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Principles of Modern Chemistry
Chemistry
ISBN:
9781305079113
Author:
David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:
Cengage Learning
Chemistry: An Atoms First Approach
Chemistry
ISBN:
9781305079243
Author:
Steven S. Zumdahl, Susan A. Zumdahl
Publisher:
Cengage Learning
