Question

in general, what conditions would best encourage the solubility of a gaseous solute in liquid water.

a low atmospheric pressure, low temperature
a low atmospheric pressure, high temperature
a high atmospheric pressure, low temperature
a high atmospheric pressure, high temperature

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question 12

at high altitude, atmospheric pressure is select an answer at lower altitudes. as a result, the solubility of oxygen gas in lakes at high altitude is select an answer at lower altitudes.
(assuming the same temperature in both loca

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question 13

select the conditions where gas solutes have the highest solubility in water.

*for this question, think about whats going on inside a soda can. what factors will affect how much carbon dioxide stays dissolved in your soda? what effect does temperature have? what effect does the pressure of carbon dioxide in the headspace above the liquid have?

• temperature: select an answer temperatures increase the solubility of a gas.
• pressure: solubility is highest when partial pressure of the gas above the liquid is select an answer.

Explanation:

Question 11 (Solubility of gaseous solute in water)

For gaseous solutes in liquid solvents (like water), pressure and temperature effects:

• Pressure: Higher pressure forces more gas molecules into the liquid (Henry’s Law), so high pressure increases solubility.
• Temperature: Gas solubility in liquids decreases with higher temperature (gases escape more easily at higher temps).

So conditions that encourage solubility: high atmospheric pressure (to push gas into water) and low temperature (to keep gas dissolved).

1. Atmospheric Pressure at High Altitude: At higher altitudes, air is less dense, so atmospheric pressure is less than at lower altitudes (e.g., mountains vs. sea level).
2. Oxygen Solubility: By Henry’s Law, gas solubility is proportional to partial pressure. Lower atmospheric pressure means lower partial pressure of O₂, so solubility of O₂ in lakes at high altitude is less than at lower altitudes (same temperature).

• Temperature Effect: For gases in water (like CO₂ in soda), lower temperatures increase solubility (cold soda keeps CO₂ dissolved better). So to maximize solubility, temperature should be "low" (since low temperatures increase gas solubility).
• Pressure Effect: By Henry’s Law, solubility is highest when the partial pressure of the gas above the liquid is high (e.g., soda cans are pressurized to keep CO₂ dissolved).

Answer:

C. a high atmospheric pressure, low Temperature

Question 12 (Atmospheric pressure and oxygen solubility at high altitude)