Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

pH Scale

Anatomy & Physiology

2. Cell Chemistry & Cell Components

pH Scale

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

A substance that minimizes changes in the concentration of H⁺ and OH^– in a solution is a __________.

hydrophobic molecule

NaCl

strong acid

buffer

Previous problemNext problem

Verified step by step guidance

Understand the concept of a buffer: A buffer is a solution that resists changes in pH when acids or bases are added. It helps maintain a stable pH by neutralizing added acids (H⁺ ions) or bases (OH⁻ ions).

Identify the role of a buffer in a solution: Buffers work by either absorbing excess H⁺ ions or releasing H⁺ ions when the concentration of OH⁻ ions increases, thereby minimizing changes in pH.

Recognize common examples of buffers: Buffers often consist of a weak acid and its conjugate base or a weak base and its conjugate acid. For example, the bicarbonate buffer system in blood involves carbonic acid (H₂CO₃) and bicarbonate (HCO₃⁻).

Differentiate buffers from other substances: Unlike strong acids, hydrophobic molecules, or salts like NaCl, buffers specifically function to stabilize pH levels in a solution.

Apply this understanding to the problem: Given the options, identify that a buffer is the correct answer as it is the substance that minimizes changes in the concentration of H⁺ and OH⁻ in a solution.