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

In the context of acids and bases, what is the role of a molecule that acts as a buffer?

It donates protons to increase the acidity of the solution.

It accepts electrons to form a stable complex.

It resists changes in pH by neutralizing added acids or bases.

It completely dissociates in solution to increase pH.

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Verified step by step guidance

Understand the concept of a buffer: A buffer is a solution that can resist pH changes upon the addition of an acidic or basic component. It typically involves a weak acid and its conjugate base, or a weak base and its conjugate acid.

Identify the role of a buffer: The primary role of a buffer is to maintain a stable pH in a solution by neutralizing small amounts of added acid or base. This is crucial in many biological and chemical systems where pH must remain constant.

Analyze the options given: Evaluate each option to determine which one aligns with the role of a buffer. A buffer does not donate protons to increase acidity, nor does it accept electrons to form a stable complex. It also does not completely dissociate in solution.

Focus on the correct option: The correct role of a buffer is to resist changes in pH by neutralizing added acids or bases. This is achieved through the equilibrium between the weak acid and its conjugate base (or vice versa) in the buffer solution.

Conclude with the correct understanding: A buffer solution is essential for maintaining pH stability in various environments, ensuring that the pH does not fluctuate significantly with the addition of small amounts of acids or bases.