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 happens to the pH of a solution when equal concentrations of a strong acid and a strong base are mixed?

The pH becomes basic, above 7.

The pH remains unchanged.

The pH becomes acidic, below 7.

The pH becomes neutral, around 7.

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Verified step by step guidance

Understand the concept of neutralization: When a strong acid and a strong base are mixed in equal concentrations, they undergo a neutralization reaction. This means that the hydrogen ions (H⁺) from the acid react with the hydroxide ions (OH⁻) from the base to form water (H₂O).

Consider the properties of strong acids and bases: Strong acids completely dissociate in water to release H⁺ ions, and strong bases completely dissociate to release OH⁻ ions. This complete dissociation is crucial for the neutralization process.

Write the chemical equation for the neutralization reaction: For example, if hydrochloric acid (HCl) is mixed with sodium hydroxide (NaOH), the reaction is:

{H Cl}_{(aq)} + {Na OH}_{(aq)} \to {Na Cl}_{(aq)} + {H O}_{(l)}

Analyze the result of the reaction: The products of the neutralization reaction are water and a salt (in this case, sodium chloride, NaCl). Water is neutral with a pH of 7, and the salt does not affect the pH significantly in this context.

Conclude the effect on pH: Since the strong acid and strong base neutralize each other, the resulting solution is neutral, with a pH around 7. This is why the correct answer is that the pH becomes neutral, around 7.