Question

You know that an unlabeled water bottle contains at least some water. You measure the freezing point of the unknown substance and find that it freezes at a temperature lower than 0 degrees Celsius at 1 atmosphere pressure. Which of the following can you conclude?
The substance is pure water.

The substance will have a boiling point that is less than 100 degrees Celsius.

The substance will have a vapor pressure that is greater than that of pure water.

The substance is an aqueous solution.

Answer 1

You know that an unlabeled water bottle contains at least some water. You measure the freezing point of the unknown substance and find that it freezes at a temperature lower than 0 degrees Celsius at 1 atmosphere pressure, The substance will have a boiling point that is less than 100 degrees Celsius.

Answer 2

The substance is an aqueous solution

An aqueous solution that contains non-volatile solute will have a lower freezing point, higher boiling point, and lower vapor pressure compared to pure water