The solubility of most solids in liquids increases with temperature. Solids dissolve in liquids because their molecules overcome the attractive forces between the molecules of the solid and enter the liquid. The higher the temperature, the more energy the molecules have to overcome these attractive forces, so the more solid dissolves in the liquid.

There are a few exceptions to this rule. For example, the solubility of calcium sulfate decreases with increasing temperature. This is because calcium sulfate molecules form strong bonds with water molecules, so the higher the temperature, the more the calcium sulfate molecules dissociate and the less able they are to dissolve in the water.

The table below shows the solubility of a few common solids in water at different temperatures.

| Solid | Solubility at 0°C (g/100g H2O) | Solubility at 100°C (g/100g H2O) |

|---|---|---|

| NaCl | 35.7 | 39.8 |

| CaSO4 | 2.06 | 0.228 |

| NaNO3 | 88 | 187 |