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...
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Transcribed Image Text:**Acid Ionization Constants and Conjugate Base Strength**
To determine the strongest conjugate base, consider the given acid ionization constants (\(K_a\)) for the following acids:
| **Acid** | **\(K_a\)** |
|------------------|-----------------|
| HF(aq) | \(3.5 \times 10^{-4}\) |
| HC\(_7\)H\(_5\)O\(_2\)(aq) | \(6.5 \times 10^{-5}\) |
| HClO\(_2\)(aq) | \(1.1 \times 10^{-2}\) |
| HC\(_2\)H\(_3\)O\(_2\)(aq) | \(1.8 \times 10^{-5}\) |
### Explanation:
- **\(K_a\) value** represents the acid strength: the lower the \(K_a\), the weaker the acid.
- **Conjugate base strength** is inversely related to acid strength: weaker acids have stronger conjugate bases.
### Conclusion:
To identify the strongest conjugate base, find the acid with the lowest \(K_a\) value. Here, HC\(_2\)H\(_3\)O\(_2\)(aq) with \(K_a = 1.8 \times 10^{-5}\) has the lowest \(K_a\), indicating its conjugate base is the strongest.
**Note:** You may want to reference Section 16.4 for further details on this topic.

Transcribed Image Text:Here is a list of anions in aqueous solution:
- \( \text{C}_7\text{H}_5\text{O}_2^- \) (aq)
- \( \text{C}_2\text{H}_3\text{O}_2^- \) (aq)
- \( \text{F}^- \) (aq)
- \( \text{ClO}_2^- \) (aq)
Each option represents an anion dissolved in water, indicated with (aq).
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