If it is saturated with a solid solute, you would expect some of the solid to precipitate out - as long as the solid could find a surface to nucleate on.
If it is saturated with a gas, you would expect more gas to dissolve into it as long as it was still in contact with the saturating gas in the gas phase.
Expands
If you are lucky the fuse will blow. If not the refrigerator might catch fire.
A solution is obtained.
It loses moisture if cooled below its dew point. It becomes more dense, and that causes it to move toward areas where the air is less dense.
A supersaturated solution contains more solute than predicted at a given temperature. This can happen when a solution is prepared with more solute than can normally dissolve in that solvent at that temperature, creating a metastable state where the excess solute remains dissolved until disturbed.
Crystallisation
If a saturated solution of copper chloride is cooled, the solubility of the compound will decrease, causing excess copper chloride to precipitate out of the solution in the form of solid crystals. This process is known as crystallization.
If a hot saturated solution is cooled quickly, the solubility of the solute decreases with temperature, causing excess solute to precipitate out of solution. This rapid cooling can result in the formation of larger crystals or a higher amount of crystals in the solution.
When a crystal of potassium nitrate is added to the saturated solution as it is cooled, it will act as a seed crystal for the excess solute to come out of solution and crystallize. If no crystal were present, the solution may remain supersaturated, meaning it contains more solute than it can naturally hold, leading to potential spontaneous crystallization or precipitation with any disturbance.
the solute can re-form as a solid
As the KNO3 solution cools, solubility of KNO3 decreases with temperature, leading to the formation of excess KNO3 crystals. These crystals will start to precipitate out of the solution as it cools. If the cooling continues, more crystals will form until the solution becomes saturated at a lower temperature.
They dissolve until the solution is saturated.
All that would happen is the solute would not absorb into the solution and it would spill off eventually.
If the solution is saturated with salt already, then adding more salt will simply see the salt settle to the base of the solution container without it dissolving.
the concentration of this solution is going to reduce.< Lets assume that the solution is comprised of water and salt> Then the water at a certain temperature begins to evaporate unlike the salt. at the end of the process, yes we agree that the solution has finally come to a room temperature, but concentration was lost during cooling. I mean that the solution becomes less concentrated
A solution can be dilute and saturated if there is a small amount of solute relative to the amount of solvent, making it dilute, but all of the solvent has already dissolved the maximum amount of solute possible at that temperature, making it saturated. This can happen when the solute has low solubility in the solvent or if the temperature decreases after the solution has been prepared.
It can happen. Then there is no solution!It can happen. Then there is no solution!It can happen. Then there is no solution!It can happen. Then there is no solution!