A solid can dissolve in a liquid and if you increase the temperature then more solid can dissolve in the liquid before it becomes saturated.

 

Why is it that increasing the temperature for when a gas dissolves in a liquid decreases the amount of gas that dissolves in the liquid before it becomes saturated?

 

Why does increasing the temperature have the opposite effect.

 

EXAMPLE

This can be seen when the temperature of a lake rises so that the dissolved oxygen levels decrease and therefore all the fish die.

Increasing the temp in a liquid increases the entropy(internal energy responsible for random molicualar movement)..this increases the space b/w the molicules so that the solid molicules can "slip" in b/w. Ant the oppesite effect u r talking about has something to with the vapour pressure of the gas. Since gas is volatile or easyly escapable, if the liquid temp is low the liquid molicules will hold the gas molicules in place!!..I think