(°C) Kb (°C*m) Freezing Point (°C)

Chemistry
Ms. Walsh
Solvent
Water (H2O)
Ethanol (C2H5OH)
Chloroform (CHCl3)
Benzene (C6H6)
Ethyl Ether (C4H10O)
Camphor (C10H16O)
Name: _______________________________
Boiling Point (°C)
100.0
78.0
61.2
80.1
34.5
208.0
Kb (°C*m)
0.51
1.20
3.63
2.53
2.02
5.95
Freezing Point (°C)
0
-114.0
-63.5
5.5
-116.2
179.8
Kf (°C*m)
1.86
4.68
4.70
5.12
1.79
40.0
1. Calculate the boiling point elevation for a solution that is 0.040 m glycerol (C3H8O3)
dissolved in ethanol.
2. What is the freezing point depression for a solution that is 0.28 m pentane dissolved in
benzene?
3. Which of the following solutions would you expect to have the lowest freezing point: a
solution of 0.1 m CaCl2, 0.1 m NaCl, or 0.1 m C12H22O11?
4. Which of the following solutions would you expect to have the highest boiling point: a
solution of 0.25 m K3PO4, 0.40 m CaSO4, or 0.30 m SrCl2?
5. What is the boiling point elevation for a solution of 0.25 m nickel (III) chloride in water?
6. A solution is prepared by adding 44.90 grams of glucose (C6H12O6) to 1,800 grams of
water. What will the freezing point of this solution be?
7. How many grams of benzoic acid (C7H6O2) must be dissolved in 78.1 grams of ethanol to
raise the boiling point of the solution by 4.00°C?
8. If 150 grams of C2H2(OH)2 are dissolved in 500 grams of water, calculate the boiling
point elevation of the solution.
9. Calculate the boiling point of a solution prepared by adding 32 grams of sodium chloride
to 350 grams of water.
10. How many grams of silver would have to be dissolved in 1120 grams of chloroform to
lower its freezing point by 0.25°C?
11. What is the freezing point for a solution of 0.67 m ethanol dissolved in water?
12. A 2.35 gram sample of an unknown compound is dissolved in 100 grams of water to
form a solution. This solution is measured to freeze at -0.50 °C. What is the molar mass
of the unknown compound?
13. A sample of an unknown salt, LiX, is added to water and completely dissociates, forming
Li+ and X- ions in solution. The aqueous solution of LiX is prepared by dissolving 11.0 g
of the compound in 535 mL of water and the solution is observed to freeze at -1.81°C.
Based on this information, determine the identity of X and name the unknown salt.

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