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 statements correctly explains why a molecule with a high pKa value is considered a weak acid?

A high pKa value indicates that the acid dissociates completely in solution.

A high pKa value means the acid has a strong tendency to donate protons.

A high pKa value implies that the acid is highly reactive with bases.

A high pKa value suggests that the acid does not easily donate protons.

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Verified step by step guidance

Understand the concept of pKa: pKa is the negative logarithm of the acid dissociation constant (Ka). It provides insight into the strength of an acid. A lower pKa value indicates a stronger acid, which dissociates more completely in solution.

Relate pKa to acid strength: A high pKa value means that the acid has a low tendency to dissociate and donate protons. This is because the acid dissociation constant (Ka) is low, indicating weak acid behavior.

Analyze the options: Evaluate each statement based on the relationship between pKa and acid strength. A high pKa value does not indicate complete dissociation, strong proton donation, or high reactivity with bases.

Identify the correct explanation: The correct statement should reflect the weak nature of the acid due to its high pKa value. A high pKa value suggests that the acid does not easily donate protons, aligning with the definition of a weak acid.

Conclude with the correct understanding: A molecule with a high pKa value is considered a weak acid because it does not readily donate protons, which is the fundamental characteristic of weak acids.