Using Freezing-Point Depression
to Find Molecular Weight
OBJECTIVES

• Determine the freezing temperature of the pure solvent, lauric acid.
• Determine the freezing temperature of a mixture of lauric acid and benzoic acid.
• Calculate the freezing point depression of the mixture.
• Calculate the molecular weight of benzoic acid.

LECTURE TOPIC REFERENCES
Review the following before performing the experiment:

Chapter Title: Solutions
Section Title: Colligative Properties: Vapor Pressure Lowering, Freezing Point Depression, Boiling Point Elevation, and Osmotic Pressure.

Tro, N. (2017). Chemistry: A Molecular Approach. 4th Edition. Boston: Pearson. (Or latest edition)