Multiple Choice
Which of the following best describes the role of a solvent in a solution?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following statements is true about the solubility of CO_2 (g) in H_2O (l)?
A
The solubility of CO_2 in water is unaffected by changes in temperature.
B
CO_2 is insoluble in water under all conditions.
C
The solubility of CO_2 in water increases as temperature decreases.
D
The solubility of CO_2 in water increases as temperature increases.
Verified step by step guidance1
Understand that the solubility of gases in liquids generally depends on temperature and pressure, with temperature having a significant effect.
Recall Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid, but temperature influences the solubility differently.
Recognize that for most gases, including CO_2, solubility decreases as temperature increases because higher temperatures provide gas molecules with more kinetic energy to escape from the liquid phase.
Therefore, the solubility of CO_2 in water increases as the temperature decreases, meaning colder water can dissolve more CO_2 gas.
Conclude that the correct statement is: 'The solubility of CO_2 in water increases as temperature decreases.'
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