Worksheet Freezing Point Depression

Worksheet Freezing point depression Name______

1. Define molality:

2. Use a word or short phrase to identify each of the following:

A. ΔTf =

B. Kf =

C. n =

D. m =

3. Write the general equation used to solve for the freezing point depression of a solution

4. A solution is made by dissolving 20.0g of NaOH in 4.00 Kg of water.

A. How many moles of NaOH are present?

B. What is the molality (m) of the solution?

C. How many moles of ions (n) are in 1 mole of NaOH?

D. What is the freezing point depression, ΔTf, for the NaOH solution in this

problem?

E. What is the freezing point, Tf, of the solution?

5. Calculate the freezing point depression of a solution made by dissolving 41.2g of NaBr in 2.00 kg of water. Show all work.

6. Calculate the freezing point of 175g CaCl2 in 1500g of water. Show all work.

7. Calculate the molality of NaCl if the freezing point of a NaCl solution is -5.58˚C. Show all work.