Featured in PASCO’s College Chemistry Instructor Guide

College Chemistry Instructor Guide

(PS-3803A)

College Instructor edition with 36 experiments covering introductory and general chemistry topics.

Freezing Point Depression

Lab Summary

Use a stainless steel temperature sensor to determine the molecular weight of a compound by measuring the freezing point depression of a solution.

Theory

Students determine the molecular weight of a compound by measuring the freezing point depression of a solution.

Method

Students gain experience conducting the following procedures:

  • Measuring the freezing point of a solvent.
  • Making a solution with a solvent that has a higher freezing point than room temperature.
  • Using phase diagrams and obtaining freezing point curves.

Sensors / Equipment Used:

PASPORT Chemistry Sensor

(PS-2170)

Allows students to measure Temperature, pH/ISE/ORP, Absolute Pressure & Voltage in one sensor. For use with PASPORT Interfaces.

Materials Used:

Erlenmeyer flask, 250-mL
Beaker, 400-mL
Test tube, 20-mL
Copper wire coil
Ring stand
Hot plate
Stirring bar
Clamp, utility - 2
Lauric acid, CH3(CH2)10COOH - 8 g
Unknown solute (use benzoic acid) - 0.5 g
Water - 300 mL

The Associated Bundle:

Advanced Chemistry Standard Sensor Bundle

(PS-2928A)

Contains the probeware for completing experiments in the College Chemistry lab manual.

Interface Required

This experiment may require software and an interface for data collection.