Freezing-point Depression & Boiling-point Elevation Problems
Name___________________________Date_______________Period_____
Answer the following on a separate sheet of paper. Write the equation, write the numbers
in the equation & draw a box around the answer. Chart on p. 438 & p.445 in book. Staple
this page to your answers.
1. A. What is the freezing-point depression of water in a solution of 17.1g sucrose,
C12H22O11, & 200g of water? Sucrose is a nonelectrolyte!
B. What is the actual freezing point of the solution?
2. A water solution containing an unknown quantity of a nonelectrolyte solute is found to have a
freezing point of -0.23oC. What is the molal concentration of the solution?
3. A solution consists of 10.3g of the nonelectrolyte glucose, C6H12O6, dissolved in 250g of
water. What is the fp depresssion of the solution?
4. In a lab experiment, the freezing point of an aqueous solution of glucose is found to be
-.325oC. What is the molal concentration of this solution?
5. If 0.500mol of a nonelectrolyte solute are dissolved in 500g of ether, what is the fp of the
solution?
6. What is the boiling-point elevation of a solution made from 20.0g of a nonelectrolyte solute
400g of water? The molar mass of the solute is 62.0g.
7. A solution contains 50g of sucrose, C12H22O11, dissolved in 500g of water. What is the
bp elevation?
*8. What is the expected fp depression for a solution that contains 2 mol of magnesium sulfate
dissolved in 1kg of water?
*9. What is the expected change in the freezing point of water ina solution of 62.5g of barium
nitrate in 1 kg of water? This is an electrolyte so you must take into account the number
of ions it splits up into in water.
*10. What is the expected bp elevation of water for a wolution that contains 150g of sodium
chloride dissolved in 1kg of water?