Buffers: Principles, Reactions and Applications (MCQ Exam)

Welcome to our new post on buffers MCQ (multiple choice questions)! In this post, we will be covering a wide range of topics related to buffers, including their definition, principles, types, preparation, reactions, and applications. These MCQs are designed to test your knowledge and understanding of buffers, and will be an excellent resource for students studying chemistry or biology.

Buffers are an important topic in chemistry, as they play a vital role in maintaining the pH of solutions. They are commonly used in biological systems to keep enzymes active and are also utilized in industrial processes and analytical chemistry. In this quiz, we will test your knowledge on the principles, types, preparation, reactions, and applications of buffers.

These multiple choice questions will cover a range of topics, including the pH of buffer solutions, the effect of adding acid or base, and the effects of dilution and addition of solute. Test your understanding of buffers and see how well you can apply your knowledge to these questions.

Whether you are just learning about buffers or looking to review and reinforce your existing knowledge, this post will provide you with the information and practice you need to succeed. So let’s get started!

Buffers MCQ: Start examination Now

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#1. What is a buffer?

A solution that resists changes in pH when small amounts of an acid or base are added

A solution that resists changes in pH when small amounts of an acid or base are added

A solution that increases the pH when small amounts of an acid or base are added

A solution that increases the pH when small amounts of an acid or base are added

A solution that decreases the pH when small amounts of an acid or base are added

A solution that decreases the pH when small amounts of an acid or base are added

A solution that has no effect on the pH when small amounts of an acid or base are added

A solution that has no effect on the pH when small amounts of an acid or base are added

#2. What is the key to understanding how buffers work?

The concept of acid-base equilibrium

The concept of acid-base equilibrium

The concept of solute-solvent interactions

The concept of solute-solvent interactions

The concept of osmosis

The concept of osmosis

The concept of diffusion

The concept of diffusion

#3. What is the equation used to calculate the pH of an acidic buffer solution?

pH = pK_a + log([A^-]/[HA])

pH = pK_a + log([A^-]/[HA])

pH = pK_b + log([B]/[HB+])

pH = pK_b + log([B]/[HB+])

pH = pK_w + log([OH^-]/[H^+])

pH = pK_w + log([OH^-]/[H^+])

pH = pK_s + log([S^-]/[HS])

pH = pK_s + log([S^-]/[HS])

#4. What is the equation used to calculate the pH of a basic buffer solution?

pH = pK_a + log([A^-]/[HA])

pH = pK_a + log([A^-]/[HA])

pH = pK_b + log([B]/[HB+])

pH = pK_b + log([B]/[HB+])

pH = pK_w + log([OH^-]/[H^+])

pH = pK_w + log([OH^-]/[H^+])

pH = pK_w + log([OH^-]/[H^+B])

pH = pK_w + log([OH^-]/[H^+B])

#5. What is the capacity of a buffer?

The amount of acid or base that can be added to a buffer before the pH starts to change significantly

The amount of acid or base that can be added to a buffer before the pH starts to change significantly

The amount of solute that can be dissolved in a buffer before the pH starts to change significantly

The amount of solute that can be dissolved in a buffer before the pH starts to change significantly

The amount of water that can be added to a buffer before the pH starts to change significantly

The amount of water that can be added to a buffer before the pH starts to change significantly

The amount of buffer that can be added to a solution before the pH starts to change significantly

The amount of buffer that can be added to a solution before the pH starts to change significantly

#6. Which of the following is NOT a type of buffer?

Acidic buffer

Acidic buffer

Basic buffer

Basic buffer

Zwitterionic buffer

Zwitterionic buffer

Neutral buffer

Neutral buffer

#7. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M?

4

4

5

5

6

6

7

7

#8. What is the pH of a buffer that is made from a weak base with a pK_b of 9 and a concentration of 0.1 M?

9

9

10

10

11

11

12

12

#9. What is the effect of dilution on the pH of a buffer solution?

It decreases the pH

It decreases the pH

It increases the pH

It increases the pH

It has no effect on the pH

It has no effect on the pH

It depends on the initial concentration of the buffer

It depends on the initial concentration of the buffer

Dilution of a buffer solution does not affect the pH because the concentration of the acid and base components of the buffer are decreased by the same factor. The ratio of acid to base remains the same, so the pH remains constant.

#10. Which of the following is NOT an application of buffers?

Regulating the pH of bodily fluids

Regulating the pH of bodily fluids

Controlling the pH of solutions during chemical reactions

Controlling the pH of solutions during chemical reactions

Stabilizing pH in cleaning and personal care products

Stabilizing pH in cleaning and personal care products

Dissolving solutes

Dissolving solutes

#11. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M, after 0.01 M of hydrochloric acid is added?

3.9

3.9

4

4

4.1

4.1

4.2

4.2

#12. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M, after 0.01 M of sodium hydroxide is added?

3.9

3.9

4

4

4.1

4.1

4.2

4.2

#13. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M, after 0.1 M of a neutral solute is added?

3.9

3.9

4

4

4.1

4.1

4.2

4.2

#14. What is the effect of adding a solute to a buffer solution?

It increases the pH

It increases the pH

It decreases the pH

It decreases the pH

It has no effect on the pH

It has no effect on the pH

It depends on whether the solute is an acid, base, or neutral

It depends on whether the solute is an acid, base, or neutral

#15. Which of the following is NOT a method for preparing a buffer solution?

Mixing a concentrated stock solution with water

Mixing a concentrated stock solution with water

Mixing individual components

Mixing individual components

Titrating a weak acid with a strong base (or vice versa)

Titrating a weak acid with a strong base (or vice versa)

Dissolving a solid in water

Dissolving a solid in water

#16. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M, after it is diluted 10-fold?

3.5

3.5

4

4

4.5

4.5

5

5

#17. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M, after it is diluted 100-fold?

3

3

4

4

5

5

6

6

#18. What is the pH of a buffer that is made from a weak base with a pK_b of 9 and a concentration of 0.1 M, after it is diluted 10-fold?

8.5

8.5

9

9

9.5

9.5

10

10

#19. What is the pH of a buffer that is made from a weak base with a pK_b of 9 and a concentration of 0.1 M, after it is diluted 100-fold?

8

8

9

9

10

10

11

11

#20. What is the effect of adding water to a buffer solution?

It increases the pH

It increases the pH

It decreases the pH

It decreases the pH

It has no effect on the pH

It has no effect on the pH

It depends on the initial concentration of the buffer

It depends on the initial concentration of the buffer

Adding water to a buffer solution does not affect the pH because the concentration of the acid and base components of the buffer are decreased by the same factor. The ratio of acid to base remains the same, so the pH remains constant.

#21. What is the effect of adding water to a buffer solution?

It increases the pH

It increases the pH

It decreases the pH

It decreases the pH

It has no effect on the pH

It has no effect on the pH

It depends on the initial concentration of the buffer

It depends on the initial concentration of the buffer

#22. How does a buffer resist changes in pH when small amounts of an acid or base are added?

By reacting with the acid or base to form a weak acid or base

By reacting with the acid or base to form a weak acid or base

By dissolving the acid or base

By dissolving the acid or base

By neutralizing the acid or base

By neutralizing the acid or base

By separating the acid or base into ions

By separating the acid or base into ions

#23. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M, after 0.01 M of hydrochloric acid is added and then 0.01 M of sodium hydroxide is added?

3.9

3.9

4

4

4.1

4.1

4.2

4.2

#24. What is the pH of a buffer that is made from a weak acid with a pK_a of 4 and a concentration of 0.1 M, after 0.01 M of hydrochloric acid is added and then 0.01 M of sodium hydroxide is added, and then 0.1 M of a neutral solute is added?

3.9

3.9

4

4

4.1

4.1

4.2

4.2

Finish - Get Results

We hope that you have enjoyed our post on buffers multiple choice questions (MCQs) and found it helpful in your studies. By working through these MCQs, you should now have a stronger understanding of the key concepts related to buffers, including their definition, principles, types, preparation, reactions, and applications.

We encourage you to continue practicing with these MCQs and other study materials to ensure that you are fully prepared for exams and other assessments. Thanks for joining us, and we look forward to seeing you in our next post!