What happens to the solubility of oxygen gas (O2) in water in each situation?
a. The pressure of O2 over the solution is decreased.
solubility decreases
solubility remains the same
solubility increases
b. The temperature is decreased.
solubility remains the same
solubility increases
solubility decreases
is b solubility increases
is a. solubility decreases
nevermind b should be solubilty decreases right
Most gases are more soluble at higher pressures. Most gases are more soluble at low T.
Think of the carbonated beverages. When you open the cap gas rushes out. That's because you have decreased the pressure of the gas from whatever it is in the bottle to 1 atm outside the bottle. And we serve carbonated beverages cold rather than hot; CO2 is more soluble in the cold.
To determine what happens to the solubility of oxygen gas (O2) in water in each situation, we need to understand the principles behind solubility.
a. When the pressure of O2 over the solution is decreased:
The solubility of a gas in a liquid generally follows Henry's law, which states that the solubility of a gas is directly proportional to the partial pressure of the gas above the solution.
So, when the pressure of O2 over the solution is decreased, the solubility of O2 will also decrease. This means that less O2 will dissolve in the water.
b. When the temperature is decreased:
In general, with most gases, solubility decreases as temperature decreases.
When the temperature of a solution decreases, the kinetic energy of the gas molecules decreases, which reduces their ability to escape from the liquid phase and results in a decrease in solubility. Therefore, in this situation, the solubility of O2 in water will also decrease.
So, to recap:
a. The solubility decreases when the pressure of O2 over the solution is decreased.
b. The solubility decreases when the temperature is decreased.