Summary of Procedure:
In this exciting conclusion to the first three experiments, the two unknown compounds are identified by their melting points and comparison to known compounds.
Positive aspects of this experiment:
+ The combined information from the first four experiments gives a definitive identification of the unknown compounds.
+ Melting point determination is a basic Organic Chemistry technique.
+ Melting points can be done with a small amount of sample.
Neutral (may be positive or negative) aspects of this experiment:
± It takes patience to wait for the oil bath to cool down. However, this is usually a short experiment. In the past, I have asked students to determine the melting points of each unknown which tends to make the experiment last longer.
Negative aspects of this experiment:
- Thiele tubes are messy. This is an oily lab.
Inquiry & Extension Ideas:
● The variance of literature melting points is a good discussion topic.
Data Links:
Student Comments:
Student_Comments_2008_MP.doc
Student Comments 2007: Melting Point
Photo Gallery:
2008 Student Handout: Melting Point
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