Freezing Point Depression to Determine Molecular Mass Lab Activity (ScholAR)

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ScholAR Determination of Molar Mass by Freezing Point Depression Lab Activity

Product Information

Aligned with AP Chemistry Lab #4

By measuring one of the properties that changes when a solute is dissolved in a solvent, in this case the freezing point, and comparing it to the freezing point of the pure solvent, it is possible to determine the solute’s molecular mass. With this experiment, students measure the freezing point of a pure substance and then a mixture to determine molar mass. This activity can be completed in 60–90 minutes, depending on the number of repetitions required, and comes with enough materials for 15 setups.

Chemical Contents:
Cetyl Alcohol
Steric Acid
BHT

Additional Materials Required:
Analytical Balance
400-mL Beaker
Test Tube, 18 mm x 150 mm
Hot Plate
Ring Stand and Clamp
Thermometer
Timer

Resources

Pre-Lab Questions
Post-Lab Questions

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