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Melting Points and Eutectic Mixtures
Student Name
Date
1
Purpose
Procedure
Experimental Data and Calculations
Data Table 1
Pure Lauric
Acid
Mass (g)
Melting
point (C)
Percent
stearic acid
by mass (%)
Mixture 1
Mixture 2
Mixture 3
_______ g
lauric acid
_______ g
lauric acid
_______ g
lauric acid
_______ g
stearic
acid
_______ g
stearic
acid
_______ g
stearic
acid
0
Pure Stearic
Acid
100
Calculations employed:
Graph 1
Insert your graph of melting temperature (C) versus percent stearic acid by
mass here.
© 2020 Carolina Biological Supply Company
2
Lab Questions
1. Compare the formulas for lauric acid and stearic acid: which one should
have the higher melting point? Explain your reasoning.
2. What is the eutectic composition for the Lauric Acid/Stearic Acid system
provided by your experiment? Does it correspond to the correct value
(33% Stearic Acid)? If not, what could be the reason?
3. Explain why a eutectic temperature is lower than the melting point of
either compound in a mixture.
4. What are the possible sources of error in this experiment? (human error is
not experimental error)
5. Would you expect citric acid (formula weight = 192 g/mol) to have a
melting temperature greater than that of lauric acid (formula weight =
200 g/mol)? Why or why not?
citric acid
Conclusions
© 2020 Carolina Biological Supply Company
lauric acid
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