OICH₂COO (ICH₂COOH, PK = 3.2) H OCH₂NO₂ (CH₂NO₂, pK₁ = 10.2) OCCI (CHCl3, PK₁ = 25) 3 a O Br (HBr, pK₂ = −9) a O NH, (NH4, pK_ = 9.4) O None of the above
OICH₂COO (ICH₂COOH, PK = 3.2) H OCH₂NO₂ (CH₂NO₂, pK₁ = 10.2) OCCI (CHCl3, PK₁ = 25) 3 a O Br (HBr, pK₂ = −9) a O NH, (NH4, pK_ = 9.4) O None of the above
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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Identify the base(s) that can deprotonate CH3COOH (pKa=4.756). The conjugate acid products produced from the deprotonation of CH3COOH and their pka values are given in parentheses. Check all that apply.

Transcribed Image Text:### Evaluation of Acids and Their Conjugate Bases
When determining the strength of an acid, the \( pK_a \) value is a critical factor. Below is a list of various acid-base pairs with their respective \( pK_a \) values:
1. **ICH\(_2\)COO\(^-\)**
- Parent Acid: ICH\(_2\)COOH
- \( pK_a = 3.2 \)
2. **CH\(_2\)NO\(_2^-\)**
- Parent Acid: CH\(_3\)NO\(_2\)
- \( pK_a = 10.2 \)
3. **CCl\(_3^-\)**
- Parent Acid: CHCl\(_3\)
- \( pK_a = 25 \)
4. **Br\(^-\)**
- Parent Acid: HBr
- \( pK_a = -9 \)
5. **NH\(_3\)**
- Parent Acid: NH\(_4^+\)
- \( pK_a = 9.4 \)
### Option:
- None of the above
### Explanation:
- **\( pK_a \) Values:**
- Lower \( pK_a \) values indicate stronger acids.
- Negative \( pK_a \) values are characteristic of very strong acids.
- **Evaluation Notes:**
- ICH\(_2\)COOH is a relatively strong acid with a low \( pK_a \).
- CH\(_3\)NO\(_2\) and NH\(_4^+\) are weak acids.
- CHCl\(_3\) has a very high \( pK_a \), indicating it is a very weak acid.
- HBr is an extremely strong acid with a negative \( pK_a \).
This assessment aids in understanding the relative strengths of these acids and their conjugate bases within a chemical context.
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