   # Compare the percent dissociation of the acid in Exercise 21a with the percent dissociation of the acid in Exercise 21d. Explain the large difference in percent dissociation of the acid. ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 14, Problem 23E
Textbook Problem
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## Compare the percent dissociation of the acid in Exercise 21a with the percent dissociation of the acid in Exercise 21d. Explain the large difference in percent dissociation of the acid.

Interpretation Introduction

Interpretation:

The percent dissociation of the acid in Exercise 21a is to be compared with the percent dissociation of the acid in Exercise 21d.

Concept introduction:

The ratio of the quantity of a given acid or a base, that has dissociated, to the initial concentration of the stated acid or base, multiplied by 100 , is termed as the percent dissociation of the acid or base.

To determine: A comparison between the percent dissociation of the acid in Exercise 21a with the percent dissociation of the acid in Exercise 21d

### Explanation of Solution

Explanation

To determine the percent dissociation of the first weak acid.

The percent dissociation of a weak acid is calculated by the formula,

α=KaC

Where,

• α is the degree of dissociation.
• Ka is the acid dissociation constant (equilibrium constant).
• C is the concentration.

Substitute the value of Ka and C in the above expression.

α=1.3×1050.100=1.3×106=1.14×102

Therefore, the percent dissociation is 1.14%_ .

To determine the percent dissociation of the second weak acid.

Refer Exercise 21d.

The calculated value of [H+] is 1.3×105M .

The given initial concentration is 0.100M

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