Ir Spectroscopy Lab Report

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Distillation and IR Spectroscopy
CHE 361L
Christian Johnson
02/17/2018
Introduction The purpose of this lab was to separate an unknown binary mixture by distillation and use IR spectroscopy along with the placement of known functional groups in order to determine the identity of the compounds. Based upon the potential unknown solutions, there are a few specific functional groups that can specifically be targeted in order to accurately depict the identity. The functional groups and specified area on the IR spectrum are located below.
By directly establishing where these certain functional groups are located on the IR spectrum, the identification of the unknown can be confidently established. Each of the potential compounds have a certain feature
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distillate graph, the temperature is at an obvious discrepancy from the known values that were presented. This could be due to the placement of the thermometer. Placing the thermometer too far or not far enough within the apparatus, or even a leak on the clamps could easily cause at least a 10 ˚C discrepancy. With this in mind, the temperature can provide a helpful insight, but the functional groups on the IR spectra can be a better indicator of the identity of the solution.
For distillate 1, the first major peak on the IR spectra arrives at 3500 cm-1 (an O-H stretch), and the second peak is at 1715 cm-1 (a C=O stretch) indicating a ketone functional group. This can mean that the distillate 1 solution contains a large amount of water. The appearance of the distillate would support this. After taking the top-half of this sample to be ran through the spectrometer, it was evident that this part of the distillate contained water with a small portion of an unknown sample. Water could be present due to the flow of the condenser. As the vapor gathers on the surface of the copper wire and moves through the condenser channel, picking up water particles is a very reasonable idea. As far as the unknown sample, it seems to lean towards being 2-Butanone. This is due to its relatively low boiling

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