Recrystallization
The Melt Station makes it possible to accurately determine the melting temperature of solid substances.
In this experiment, your students will determine the melting point of benzoic acid sample. Students will recrystallize the sample to increase its purity. Finally, they will retest the melting point of the recrystallized product.
PRODUCT INFO
This U-PIK will include enough materials for six student groups. Suggested group size is 2-3 students. The U-PIK will include the following:
- 6 melt stations
- 6 vials of capillary tubes
- 6 LabQuest 2 interfaces
- 6 vials of benzoic acid (crude)
- 7 100 mL beakers
- 7 250 mL beakers
- 7 stirring rods
- 7 bags of transfer pipettes
- 6 boxes of kimwipes
- 6 hot plates
- 6 watch glasses
- 6 boxes of filter paper
- 6 filtration units
WHEN TO INTEGRATE?
The melt station can be easily used to support the concept of melting point and intermolecular forces. This experiment can be included when first discussing the difference among solid, liquid, and gas. A discussion on product purity (or how substances are rarely 100% pure) would be helpful to students.
No mathematical calculations are required for this experiment. Due to its introductory nature, the laboratory can be introduced in a middle school science classroom.
Time: Two days. Overnight drying is encouraged, with a follow-up melting point determination on a second day.
Student Level:
BEGINNER (Grades 5-12)
Melt Station User Manual
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