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
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...
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
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY