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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Problem 13b

Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
As a solution's pH rises, it becomes more acidic.

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Understand the concept of pH: pH is a measure of the hydrogen ion (H⁺) concentration in a solution. A lower pH indicates a higher concentration of H⁺ ions (more acidic), while a higher pH indicates a lower concentration of H⁺ ions (more basic or alkaline).

Analyze the statement: 'As a solution's pH rises, it becomes more acidic.' A rising pH means the solution is becoming less acidic and more basic, as the H⁺ ion concentration decreases.

Determine the truth of the statement: The statement is false because a rising pH does not indicate increasing acidity; it indicates decreasing acidity and increasing alkalinity.

Correct the false statement: The corrected statement would be, 'As a solution's pH rises, it becomes less acidic and more basic.'

Review the corrected statement to ensure it aligns with the scientific understanding of pH and acidity.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

pH Scale

The pH scale measures the acidity or basicity of a solution, ranging from 0 to 14. A pH of 7 is considered neutral, while values below 7 indicate acidity and values above 7 indicate alkalinity. Understanding the pH scale is essential for interpreting how changes in pH affect a solution's properties.

Acidity and Basicity

Acidity refers to the concentration of hydrogen ions (H+) in a solution, which increases as pH decreases. Conversely, basicity refers to the concentration of hydroxide ions (OH-), which increases as pH rises. This relationship is crucial for understanding how a solution's pH affects its chemical behavior.

Chemical Reactions and pH

Many chemical reactions are pH-dependent, meaning that the rate and direction of these reactions can change with varying pH levels. For example, as a solution's pH rises and becomes more basic, it can alter the solubility and reactivity of certain compounds, impacting overall chemical behavior.

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Related Practice

Textbook Question

If you were given a solution that has a pH of 8.5, what would be its concentration of protons? What is the difference in proton concentration between this solution and one that has a pH of 7?

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Textbook Question

A recent experimental study looked at the combined effects of ocean acidification and increased ocean temperatures, both aspects of climate change, on the growth of polyps, juvenile coral animals. Researchers reported the average polyp biomass (in μg/polyp) after 42 days of growth under four treatments: a control with pH and temperature maintained close to normal reef conditions, a pH lowered by 0.2 units, a temperature raised by 1°C, and a combined lower pH and higher temperature. The results showed that polyp biomass was reduced somewhat in both the low-pH and high-temperature treatments, but the combined treatment resulted in a reduction in growth by almost a third—a statistically significant result. Experiments often look at the effects of changing one variable at a time, while keeping all other variables constant. Explain why this experiment considered two variables—both a higher temperature and a lower pH—at the same time.

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Multiple Choice

Buffers are substances that help resist shifts in pH by:

Explain how buffer systems in the body work if the pH of body fluids increases. Is this an example of a negative or a positive feedback loop? Explain.

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Textbook Question

Some claim that the pH of your blood can be affected by eating acidic foods such as citrus. Do you believe this to be true? Explain your answer. (Hint: What happens when extra hydrogen ions are added to the blood?)

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Multiple Choice

What is the relationship between pH and hemoglobin saturation in erythrocytes?

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Multiple Choice

In a neutral solution, the concentration of __________.