1. Solubility Curves

2. Saturated solutions
Solutions in which additional solute cannot dissolve and excess solute will precipitate.
Maximum amount of dissolved solute at a given temperature and pressure.
Unsaturated solutions
Solutions that are not yet saturated, i.e. the solvent can still dissolve a further amount of solute.
Supersaturated solutions:
Sometimes, under special circumstances, a solvent can dissolve more than its maximum amount
This can be achieved by heating a solution, saturating it at a higher temperature, then allowing it to cool
Unstable solutions, any disturbance will usually cause rapid precipitation of the excess solute

3. A solubility curve is a plot of solubility versus temperature.
The line represents a saturated solution.
Points below the line represent unsaturated solutions.
Points above the line represent a supersaturated solution.

4. Solubility Curve for Ionic Compounds

5. Solubility Curve for Gases