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November 29, 2014

Homework Help: Lab conclusion- HELP!

Posted by Richard on Monday, February 5, 2007 at 10:46pm.

I' am currently trying to wrie a couple of lab conclusions and having a hard time coming up with good points to make for the following lab experiment:
Thin layer chorotography

If anyone has a few minutes to give me a couple tips on how to improve this. I think it sounds like a summary with not enough anyalis of the data and what it means.

THANKS!

Here it is:

A chromatography lab experiment is used to separate chemical compounds from one another. Using flourene, fluorenol, fluorenone, two unknowns, and a reference mixture
we found how far they were able to travel from measuring their solvent fronts after development of the TLC plates. Using this information Rf vaules were calculated for flourene, fluorenol, and fluorenone, from these specific values their polarities could then be determined. Fluorene’s Rf value was 0.94 making it the least polar, fluorenol’s Rf vaule was 0.28 making it the most polar, and fluorenone’s Rf value was 0.64 making it intermediate in terms of polarity. The unknowns were discovered by comparison of the TLC plates of flourene, flurenol, and fluorenone. In the second part of the chromatography experiment there were to be timed intervals when adding the compounds to the TLC plates, this was to watch the progress and reduction of flurenone to fluorenol.






I think it sounds like a summary, also. Did you mean you thought you needed two conclusions to report in this experiment OR you have another report to write and you will need a conclusion for that one, too. See below for some coments.

A chromatography lab experiment is used to separate chemical compounds from one another. Using flourene, fluorenol, fluorenone, two unknowns, and a reference mixture
we found how far they were able to travel from measuring their solvent fronts after development of the TLC plates. Using this information Rf vaules were calculated for flourene, fluorenol, and fluorenone, from these specific values their polarities could then be determined. Fluorene’s Rf value was 0.94 making it the least polar, fluorenol’s Rf vaule was 0.28 making it the most polar, and fluorenone’s Rf value was 0.64 making it intermediate in terms of polarity. The unknowns were discovered by comparison of the TLC plates of flourene, flurenol, and fluorenone. In the second part of the chromatography experiment there were to be timed intervals when adding the compounds to the TLC plates, this was to watch the progress and reduction of flurenone to fluorenol.

Conclusions:
Thin layer chromatography (TLC) may be used to separate similar compounds. The substrate used in this experiment was aluminum oxide and the moving phase was hexane. The Rf values for fluorene, fluorenol, and fluorenone were measured; the polarity of each of the compounds was determined from the Rf value. Table ?? shows the results for Rf values as well as the polarity of each compound tested.

TLC may be used, also, to identify compounds. In this experiment, two unknowns were subjected to the same procedure described above and the Rf values were used to identify the components successfully.

ETC.
another conclusion is that you were able to watch the progress of the reduction of flurenone to fluorenol.

Don't use my wording but this will give you an idea of what I would turn in. It lists two conclusions and I didn't write about everything that was done. The table to which I refer above may have been done and it may in the procedure/results somewhere. If so, you need not print the table again; simply refer to it in the conclusions. I hope this is of some value. Perhaps other tutors will have other suggestions.

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