What is the boiling point of an aqueous solution that freezes at −6.7 °C?

Solution: Here, we are going to determine the boiling point.

Step1:

The depression of freezing point of a solution is calculated by the equation:

Tf = m x Kf --------(1)

Where m is the molality of the solution and Kf is the freezing point depression constant for the solvent.

Similarly, the elevation of boiling point of a solution is calculated by the equation:

Tb = m x Kb --------(2)

Where m is the molality of the solution and Kb is the boiling point elevation constant for the solvent.

Step2:

The freezing point of water = 0oC

Freezing point of the solution = -6.7oC

Therefore, depression in freezing point(Tf ) = 0oC - (-6.7oC)

= 6.7oC

Freezing point depression...