A solution is prepared at 75 °C by dissolving 50.0 g of A in 100 g of water.When this solution is cooled to 15 °C what happens based on the following solubility plot for A.
A)Solid A crystallizes and the solution is unsaturated.
B)Solid A dissolves and the solution is supersaturated.
C)Solid A crystallizes and the solution is saturated.
D)Solid A dissolves and the solution is unsaturated.

Question

A solution is prepared at 75 °C by dissolving 50.0 g of A in 100 g of water.When this solution is cooled to 15 °C what happens based on the following solubility plot for A. 
A)Solid A crystallizes and the solution is unsaturated. 
B)Solid A dissolves and the solution is supersaturated. 
C)Solid A crystallizes and the solution is saturated. 
D)Solid A dissolves and the solution is unsaturated.

Quizplus · Accepted Answer

Based on the solubility plot, at 15°C the solubility of A in water is about 40 g/100 g of water, which is less than the initial concentration of A in the solution (50.0 g/100 g). Therefore, some of the A will crystallize out of the solution, leading to a decrease in concentration and saturation of the solution.

A Solution Is Prepared at 75 °C by Dissolving 50