Lab 3 - Lena Kazer Chemistry 3AL Experiment 3 7-6-10 Mixed...

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Lena Kazer Chemistry 3AL Experiment 3 7-6-10 Mixed Melting Points Purpose: To find the melting range of an unknown compound, and to find an identical compound through the use of mixed melting points. To generate a melting-point composition diagram, and to determine the composition of a mixture by using melting point analysis. Discussion: Part 1: Upon receiving unknown compound #222—a fine white powder—I put it into two melting-point capillaries. After finding compound #222’s approximate melting point range (103.1ºC-104.6ºC) by having the melting point apparatus increase at a rate of 6ºC/min, I found a more accurate melting point range by setting the rate to 2ºC/min: 101.0ºC- 102.5ºC. Using my melting point data, I found Dylan, whose unknown compound #013 had the same appearance as my unknown sample and similar melting range: 96.0ºC-99.0ºC. After mixing our samples in a 1:1 ratio, we found the mixed melting point range of our homogenously mixed sample to be 90.0ºC -90.5ºC. This indicates that there was a depression, as the melting point was drastically lower than expected. This indicates that Dylan and I had different compounds. I had a similar result when I mixed my compound with Linc, compound #017. Her melting range was 97.6ºC -98.9ºC, however our mixed sample depressed and melted at 89.9ºC-90.0ºC. With Raoult’s Law in mind, this depressed melting point clearly reinforces the fact that compounds #222 and #017 are different compounds. I then matched up with Michelle, whose unknown compound #018 had a melting range of
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Lab 3 - Lena Kazer Chemistry 3AL Experiment 3 7-6-10 Mixed...

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