Solubility & Temperature

[MowgliR]

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Destroyer GC #110

Which statement is false?

a. CO2 solubility increases with increasing temperature
b. CO2 solubility increases with increasing pressure
c. When KOH is dissolved in water, we see a decrease in the vapor pressure of the solution
d. The solubility of a gas increases as the temperature decreases
e. Two of these


Answer: A


I thought E was the correct answer, as A and D are false. Can someone explain why statement D is false?

 

[loveoforganic]

D is true. Dunno how to explain it further

 

[wizi]

Destroyer GC #110

Which statement is false?

a. CO2 solubility increases with increasing temperature
b. CO2 solubility increases with increasing pressure
c. When KOH is dissolved in water, we see a decrease in the vapor pressure of the solution
d. The solubility of a gas increases as the temperature decreases
e. Two of these


Answer: A


I thought E was the correct answer, as A and D are false. Can someone explain why statement D is false?

D is true and I am going to use Chad's example to explain it.

Think of when you boil Spaghetti, you see a lot of bubbles coming out right? Those are gases. As you increase the temperature, those gases become insoluble and form bubbles.

I hope that example makes sense. Let me know if you still have questions.

 

[yankeefan86]

Hey Randy, remember as temperature DECREASES, the solubility of GAS INCREASES which makes choice D true. Choice A is false because the solubility of a SOLID will increase as temperature INCREASES not a gas such as c02. hope this helps dude

 

[invictusx]

Destroyer GC #110

Which statement is false?

a. CO2 solubility increases with increasing temperature
b. CO2 solubility increases with increasing pressure
c. When KOH is dissolved in water, we see a decrease in the vapor pressure of the solution
d. The solubility of a gas increases as the temperature decreases
e. Two of these


Answer: A


I thought E was the correct answer, as A and D are false. Can someone explain why statement D is false?

Because this doesn't describe an ideal gas. More gas is present in a solution with a lower temperature compared to a solution with a higher temperature. Also, D is correct. As temperature increases the average kinetic energy of all particles increase, allowing for the gases dissolved to evaporate more readily, increasing entropy. In essence, so.. they are in gas form. An increases in temperature will additionally increase the motion of dissolved particles by weakening forces between solute and solvent so gas particles can escape the solution and become vapor. So, an increase in temperature will correspond to a decrease in the solubility of gases. Hence, if you decrease temperature, you increase solubility.

http://www.elmhurst.edu/~chm/vchembook/174temppres.html Use this as reference

 

[MowgliR]

I realized I misread statement D...Thanks everyone for your input! Too much late night studying without breaks lol

High temp = decrease solubility
Low temp = increase solubility