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 an experiment to test the acidity of various solutions, which solution would typically serve as the negative control?

Acetic acid

Sodium hydroxide

Distilled water

Hydrochloric acid

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Verified step by step guidance

Understand the concept of a negative control: In scientific experiments, a negative control is a group or sample where no effect is expected. It helps to ensure that the experimental setup is working correctly and that any observed effects are due to the experimental variable.

Identify the role of each solution in terms of acidity: Acetic acid, hydrochloric acid, and sodium hydroxide are all chemicals that will affect the acidity or basicity of a solution. Acetic acid and hydrochloric acid are acids, while sodium hydroxide is a base.

Consider the properties of distilled water: Distilled water is neutral, meaning it has a pH of around 7. It does not contain any acids or bases that would alter the acidity of a solution.

Determine which solution would not affect the acidity: Since distilled water is neutral, it serves as a negative control because it does not change the acidity of the solution being tested.

Conclude that distilled water is the appropriate negative control: In an experiment testing acidity, distilled water is used as the negative control to ensure that any changes in acidity are due to the solutions being tested and not other factors.