Passage III

The solubility of a substance is typically defined as the maximum mass, in grams (g), of the substance (the solute) that will stay dissolved in 100 g of a solvent (such as water). The solubility of a substance generally varies as the temperature of the solvent changes. Figure 1 shows, for each of 5 substances, how solubility in water varies with temperature.

Figure 2 shows, for 3 temperatures (25°C, 40°C, and 60°C), how the solubility of sucrose varies as the percent by mass of water in solvent mixtures of water and ethanol varies.

Figure 2 adapted from A. M. Peres and E. A. Macedo, "Phase Equilibria of D-glucose and Sucrose in Mixed Solvent Mixtures: Comparison of UNIQUAC-based Models." ©1997 by Elsevier Science Ltd.