chemsample-infraredspectroscopy-tlc-results


 * ​Results**

(note: there is a lot of white space under each picture. keep scrolling to see more results) These are the TLC plates when we were trying to determine which eluent was the most suitable. As can be observed, neither produced a clear demarcation for the solution. The methanol was too polar, pulling all the compounds into one spot. The hexane was not polar enough to pull some of the compounds at all.



The solution that was chosen was toluene based on the class results. Using toluene in the developing chamber, three plates were tested. One, had the stock on one side and a known species from that solution on the other. The following plate shows stock next to benzophenone.

This stock on the left shows a good, even distribution of the three compounds. We can now saw that the middle spot is benzophenone based on the Rfs calculated. The middle spot on the left was Rf= 24 mm/59mm = 0.41 This is the same for the benzophenone, which can be observed by the location of the spot. Using the data from other groups we calculated the Rf for the rest of the compounds: biphenyl Rf= 42 mm/ 59 mm = 0.71 benzhydrol Rf= 10 mm/ 59 mm = 0.17

Using this information we can figure out the compounds in our unknown, which are pictured below:

Unknown #2 has one Rf of 0.41 and another of 0.17. That means this solution contained benzophenone (middle) and benzhydrol (bottom). Unknown number 4 contains biphenyl (Rf =0.71) and benzhydrol (Rf = 0.17).

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