A solid has a solubility at room temperature of 78 grams per liter. If 1.0 L of a heated solution containing 100. g of solute is cooled to room temperature, how much solid is formed?
A)22 g
B)100 g
C)78 g
D)1 L
E)78g/L

Question

Quizplus · Accepted Answer

Since the solubility of the solid is 78 g/L at room temperature, any additional solute that is added beyond this amount will not dissolve and will form a solid when the solution is cooled to room temperature.

The amount of solute in the heated solution is 100 g, which is greater than the solubility at room temperature. Therefore, 78 g of the solute will dissolve while the remaining 22 g will form a solid upon cooling.

Thus, the amount of solid formed is 22 g, which is choice A.

A Solid Has a Solubility at Room Temperature of 78