Question

Compared to pure water, a 1 M sugar-water solution will have a:
1. Lower vapor pressure, lower boiling point and lower freezing point.
2. Lower vapor pressure, higher boiling point and lower freezing point.
3. Lower vapor pressure, lower boiling point and higher freezing point.
4. Higher vapor pressure, higher boiling point and higher freezing point.

Answer 1

The answer will be 2- lower vapor pressure, higher boiling point and lower freezing point.

Answer 2

Compared to pure water, a 1 M sugar-water solution will have a lower vapor pressure, higher boiling point and lower freezing point.

Vapor pressure, boiling point and freezing point are all called colligative properties. They depend on the amount of solute present in the system.

The presence of a solute leads to decrease in vapor pressure, increase in boiling point and decrease in freezing point of the pure solvent.

Hence, compared to pure water (which is the pure solvent); a 1 M sugar-water solution (the solution) will have a lower vapor pressure, higher boiling point and lower freezing point.

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