Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

18. Aqueous Equilibrium

Intro to Buffers

General Chemistry

18. Aqueous Equilibrium

Intro to Buffers

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Multiple Choice

Which statement is true about pH buffers?

Buffers are effective only at pH 7.

Buffers increase the pH of a solution significantly.

Buffers resist changes in pH when small amounts of acid or base are added.

Buffers can only be made from strong acids and strong bases.

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Verified step by step guidance

Understand the role of a buffer: A buffer is a solution that can resist pH changes when small amounts of an acid or a base are added. This is due to the presence of a weak acid and its conjugate base, or a weak base and its conjugate acid.

Evaluate the first statement: 'Buffers are effective only at pH 7.' This is incorrect because buffers can be effective at a range of pH values, not just at pH 7. The effectiveness of a buffer depends on the pKa of the acid/base pair used.

Evaluate the second statement: 'Buffers increase the pH of a solution significantly.' This is incorrect because buffers are designed to maintain a stable pH, not to increase it significantly.

Evaluate the third statement: 'Buffers resist changes in pH when small amounts of acid or base are added.' This is correct as it accurately describes the primary function of a buffer.

Evaluate the fourth statement: 'Buffers can only be made from strong acids and strong bases.' This is incorrect because buffers are typically made from weak acids and their conjugate bases, or weak bases and their conjugate acids, not strong acids or bases.