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

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Multiple Choice

A glass of grapefruit juice, at pH 3, contains __________ H⁺ as a glass of tomato juice, at pH 4.

one-tenth as much

half as much

twice as much

ten times as much

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Verified step by step guidance

Understand the concept of pH: pH is a measure of the hydrogen ion concentration in a solution. It is calculated using the formula: \( \text{pH} = -\log_{10}[H^+] \). A lower pH value indicates a higher concentration of hydrogen ions.

Compare the pH values: Grapefruit juice has a pH of 3, and tomato juice has a pH of 4. This means grapefruit juice is more acidic than tomato juice.

Calculate the difference in pH: The difference in pH between grapefruit juice and tomato juice is 1 (4 - 3 = 1).

Determine the change in hydrogen ion concentration: Since pH is a logarithmic scale, a difference of 1 pH unit corresponds to a tenfold difference in hydrogen ion concentration. Therefore, grapefruit juice has ten times the concentration of hydrogen ions compared to tomato juice.

Conclude the comparison: Based on the calculations, a glass of grapefruit juice contains ten times as much \( H^+ \) as a glass of tomato juice.