Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

3. Acids and Bases

Acids and Bases

Organic Chemistry

3. Acids and Bases

Acids and Bases

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Multiple Choice

Which of the following is a characteristic of a weak acid in aqueous solution?

It completely dissociates into ions.

It forms a strong conjugate base.

It partially dissociates into ions.

It has a high pH value.

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Verified step by step guidance

Understand the concept of acid dissociation: In aqueous solutions, acids can dissociate into ions. The extent of this dissociation determines whether an acid is strong or weak.

Define a weak acid: A weak acid is one that does not completely dissociate in water. Instead, it partially dissociates, meaning that only a fraction of the acid molecules release hydrogen ions (H⁺) into the solution.

Explore the dissociation equilibrium: For a weak acid, the dissociation can be represented by the equilibrium equation:

A_{H} (aq) \leftrightarrow A_{-} (aq) + H_{+} (aq)

. This equilibrium indicates that both the undissociated acid and its ions are present in the solution.

Discuss the conjugate base: A weak acid forms a weak conjugate base. The strength of the conjugate base is inversely related to the strength of the acid. Since a weak acid does not fully dissociate, its conjugate base is not particularly strong.

Clarify the pH value: Weak acids typically have a pH value lower than 7 but higher than that of strong acids. The partial dissociation results in fewer hydrogen ions in solution compared to strong acids, leading to a higher pH than a strong acid but still acidic.