Question

Compared to pure water, a 1.0m sucrose solution would have a ____

multiple choice
A. a lower boiling point, a higher melting point, and a higher vapor pressure
B. a higher boiling point, a lower melting point, and a higher vapor pressure
C. a lower boiling point, a higher melting point, and a lower vapor pressure
D. a higher boiling point, a lower melting point, and a lower vapor pressure
E. these properties can not be determined based upon the information provided

Answer 1

A 1.0m sucrose solution compared to pure water has a higher boiling point, a lower melting point, and a lower vapor pressure due to the colligative properties resulting from the addition of a non-volatile solute.

Step-by-step explanation:

Compared to pure water, a 1.0m sucrose solution will exhibit different colligative properties due to the presence of the sucrose molecules. When a non-volatile solute like sucrose is added to water, it causes the solution to have a higher boiling point and a lower vapor pressure than the pure solvent. This is because the solute particles in the solution disrupt the solvent's normal tendency to change into a vapor.

As a result, more heat (energy) is required for the water molecules to escape into the vapor phase, which means the boiling point goes up. The presence of sucrose also results in a lower melting point (or freezing point), which is another colligative property that changes with the addition of a solute. The final effect is that the introduction of sucrose to water leads to boiling point elevation, freezing point depression, and vapor pressure lowering.