Solubility Exceptions

[MedPR]

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Based on le chatelier's alone, I understand that increasing the temperature doesn't always increase solubility. TBR makes it a point to mention this though, so I got more curious.

In most cases, an increase in temperature results in an increase in the amount of salt that dissociates into solution, but there are some exceptions.

Does anyone know of any specific exceptions? Exceptions that might pop up on the MCAT (like how Mg(OH)2 is insoluble) just to try and make sure everyone gets at least 1 wrong?

 

[Ineedhopenow]

Gases. Increase in T decreases a gas' solubility in a fluid (i.e. soda).

 

[SaintJude]

But true story: solubility of a gas does decrease with an increase in temperature. But it's easy to remember b/c an increase in temperature correlates to an increase in average kinetic energy of a system. This higher average kinetic energy imparts more energy for molecules to escape the liquid phase and enter the vapor phase.