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Ch. 21 The Respiratory System
Chapter 21, Problem 21.12a

Henry's law states that the degree to which a gas dissolves in a liquid is determined by its:


a. partial pressure.
b. solubility.
c. surface tension.
d. Both a and b are correct.
e. All of the above are correct.

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1
Identify the key concept: Henry's law, which relates to the solubility of gases in liquids.
Understand that Henry's law states that the amount of gas that dissolves in a liquid is proportional to the partial pressure of the gas above the liquid.
Recognize that solubility is also a factor in determining how much gas can dissolve in a liquid, as it is a measure of how well the gas can dissolve.
Evaluate the options: (a) partial pressure, (b) solubility, (c) surface tension, (d) both a and b, (e) all of the above.
Determine that both partial pressure and solubility are relevant to Henry's law, while surface tension is not directly related.

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Key Concepts

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

Henry's Law

Henry's Law describes the relationship between the solubility of a gas in a liquid and the partial pressure of that gas above the liquid. It states that at a constant temperature, the amount of gas that dissolves in a liquid is directly proportional to the partial pressure of that gas. This principle is crucial for understanding gas behavior in solutions, particularly in fields like chemistry and environmental science.
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Partial Pressure

Partial pressure refers to the pressure exerted by a single component of a mixture of gases. In the context of Henry's Law, it is the pressure of the gas above the liquid that influences how much of that gas will dissolve in the liquid. Understanding partial pressure is essential for predicting gas solubility and is widely applied in various scientific and industrial processes.
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Solubility

Solubility is the maximum amount of a substance (solute) that can dissolve in a given amount of solvent at a specific temperature and pressure. It is a key factor in determining how gases behave in liquids, as different gases have different solubility levels. The concept of solubility is fundamental in chemistry, particularly in reactions involving gases and liquids.
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