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 acid-base titrations, when should a positive control be used?

To neutralize the solution after the titration is complete

To ensure the titration setup is functioning correctly by using a known acid or base

To determine the endpoint of the titration by using an unknown solution

To calibrate the pH meter before starting the titration

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Verified step by step guidance

Understand the purpose of a positive control in an experimental setup. A positive control is used to confirm that the experimental setup is functioning correctly by using a known substance with a predictable outcome.

In the context of acid-base titrations, a positive control can be a known acid or base that is used to verify the accuracy and reliability of the titration process.

Consider the role of a positive control in ensuring the titration setup is functioning correctly. It helps to validate the procedure and equipment, such as the burette and pH meter, by providing a reference point.

Recognize that a positive control is not used to neutralize the solution after the titration is complete. Its primary function is to ensure the setup is working as expected before proceeding with the actual titration.

A positive control is also not used to determine the endpoint of the titration with an unknown solution. Instead, it is used to calibrate and verify the setup using a known substance, ensuring accurate results during the titration process.