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.
19. Based on Figure 1, the maximum mass of KI, in milligrams (NOT grams), that will stay dissolved in 100 g of water at 20°C is closest to which of the following?
Your Answer is
Correct Answer is D
Explanation
In Figure 1, KI 20°C is about 140g, 140*1000=140,000 mg, so choose D