- 4 40 Pts Freezing Point T Depression Is One Of The Colligative Properties Of Solution In Dilute Limit Which Is Att 1 (63.57 KiB) Viewed 17 times
4. (40 pts) Freezing point (T) depression is one of the colligative properties of solution in dilute limit, which is attributed to the change of chemical potential of pure solvent by adding a solute. (1) (20 pts) Explain the freezing point depression using chemical potential-temperature diagram. (2) (20 pts) By measuring the freezing point depression of the solution compared to the pure solvent, one can estimate the molecular weight (Mw) of the unknown solute. An addition of 2.00 g of unknown compound reduces the freezing point of 75.00 g of benzene from 5.50 to 4.92 °C. What is the molar mass of the compound? Benzene's Kf is 5.12 °C m¹¹.