CHEM 241L George Mason University Organic Chemistry & Melting Point Lab Report

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MELTING POINT

PURPOSE

(Specifically state the purpose of the experiment and evaluation methods in a few sentences.)

Example:

The purpose of this experiment is to separate hexane and toluene from a mixture by distillation using Hickman Still apparatus. After isolation of each component, gas chromatography is used to evaluate the efficiency of the Hickman distillation technique performed.

PROCEDURE

• (For this dry lab experiment, write a general procedure from the experiment video, .)

DATA/RESULTS

• MELTING POINT RANGES
• MELTING POINT DIAGRAM (plot the lowest temperature of each melting point range)

CONCLUSION

(This is the section in which you interpret the data obtained in the previous section. It demonstrates that you understand and can interpret the data you have collected. Interpret the data obtained, observations, graphs, etc. and compare with literature sources where necessary. Relate the experimental results to the theory discussed in the introduction. This section also addresses the yield and purity of products and possible sources of error that may have influenced these results.)

Post-Lab Questions

1. Define “melting point” of a substance.
2. What is the purpose of melting point determination?
3. What is the effect of a small amount of impurity on the melting point range of an organic compound?
4. If the melting point of an organic compound is 2 ?C higher with a narrow melting range (< 1 ?C) than the literature value, how would you determine the purity of the compound? Is it pure or impure? Explain thoroughly for full credit.