Boiling Point Elevation and Freezing Point Depression (13.3.2)

Question 1

• As solute is added to a solvent, the vapor pressure of the solvent decreases, increasing the boiling point of the solution.

Answer 1

• As solute is added to a solvent, the vapor pressure of the solvent decreases, increasing the boiling point of the solution.

Question 2

• As more solute is added and the vapor pressure drops, the triple point of the solution decreases causing a depression in the freezing point.

Answer 2

• As more solute is added and the vapor pressure drops, the triple point of the solution decreases causing a depression in the freezing point.

Question 3

• Mathematical relationships relating the concentration of solute to the change in freezing or boiling point are ∆Tf = – Kfm and ∆Tb = Kbm.

Answer 3

• Mathematical relationships relating the concentration of solute to the change in freezing or boiling point are ∆Tf = – Kfm and ∆Tb = Kbm.