2.6 Solubility
The solubility of a substance is the maximum amount of solute that can be dissolved in an amount of solvent at a certain temperature. Therefore, it describes the concentration of a saturated solution. Solubility changes with temperature.
| Substance | 10 °C | 25 °C | 50 °C |
|---|---|---|---|
LiCl |
73.8 |
84.5 |
94.1 |
NaCl |
32.7 |
36 |
36.7 |
KCl |
30.9 |
35.5 |
43 |
NaOH |
63.9 |
100 |
170.3 |
Plot
Figure 2.11: Aqueous solubilities (g/100g) of some salts at various temperatures
Temperature affects solubility. If solubility increases with increasing temperature, the dissolution process is endothermic. If solubility decreases with increasing temperature, the dissolution process is exothermic.