The fact that the boiling point of a pure solvent is lower than the boiling point of a solution of the same solvent is a direct consequence of the
A)freezing-point depression of the solution.
B)vapor pressure of the solution being higher than the vapor pressure of the pure solvent.
C)osmotic pressure of the solvent being lower than the osmotic pressure of the solution.
D)vapor pressure of the solution being lower than the vapor pressure of the pure solvent.
E)osmotic pressure of the solvent being higher than the osmotic pressure of the solution.

Question

Quizplus · Accepted Answer

The vapor pressure of a solution is lower than the vapor pressure of the pure solvent because the solute particles decrease the number of solvent particles at the surface. This leads to a higher boiling point for the solution than the pure solvent. Thus, option D is the correct answer. The freezing-point depression and osmotic pressure options are not related to the boiling point of a solution.

The Fact That the Boiling Point of a Pure Solvent