Multiple Choice
Which of the following compounds is insoluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Oxygen gas is most soluble in water under which set of conditions?
A
Low temperature and low pressure
B
High temperature and low pressure
C
Low temperature and high pressure
D
High temperature and high pressure
Verified step by step guidance1
Understand Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid. Mathematically, this is expressed as $C = k_H \times P$, where $C$ is the concentration (solubility) of the gas, $k_H$ is Henry's law constant, and $P$ is the partial pressure of the gas.
Recognize that increasing the pressure of oxygen gas above water increases its solubility because more gas molecules are forced into the solution.
Consider the effect of temperature on gas solubility: generally, gas solubility decreases as temperature increases because higher temperatures provide gas molecules with more kinetic energy to escape from the liquid phase.
Combine these two concepts: to maximize oxygen solubility in water, you want high pressure (to increase gas concentration) and low temperature (to reduce gas escape from the solution).
Therefore, the set of conditions that makes oxygen gas most soluble in water is low temperature and high pressure.
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