Lab Conclusion: Solvent Extraction with Acid Base Reactions

Lab Report: Solvent Extraction with Acid Base Reactions –¬†Brandon Skenandore

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Time spent researching and writing: 2 hrs


CHEM 308-004

Solvent Extraction with Acid/Base Reactions Lab conclusion



The purpose of this laboratory experiment was to separate three different compounds of a different pH using macroscale solvent extraction and acid/base reactions. The initial 3.001g of a mixture of benzoic acid, biphenyl, and ethyl 4-aminobenzoate was dissolved in ether. This was then mixed in a separatory funnel with HCl and NaOH separately to draw out ethyl 4-aminobenzoate and benzoic acid, respectively. Separation definitely took place, because different precipitate formed for each solution, even though the compounds were of the same color and similar properties (…)

There is no way in this lab to definitively prove that the compounds are indeed what they are with the time given, so it is assumed by theory that these compounds were indeed separated. Once these compounds were separated out, the biphenyl dissolved in diethyl ether (after salting out) was then decanted and drawn out using a rotovap. The benzoic acid and ethyl 4-aminobenzoate solutions were neutralized, then the prepitate was dried using a Buchner funnel vacuum apparatus. Even though the compounds were of the same color, there were definitive differences between the qualities of the powders. The biphenyl powder stuck to the round bottom flask. The ethyl 4-aminobenzoate was crystally and flaky, and very white. The benzoic acid was more powdery, grainy, and less flaky. This proves that these were definitely different compounds, although further tests would need to be done to firmly confirm the identity of the compounds. The weights of each compound, in order of extraction, were 1.067 g, 1.210 g, and 1.016 g. This adds up to a total of 3.293 g of dried material. Since the Buchner funnel vacuum was not completely efficient, there was some moisture still in the dried benzoic acid and ethyl 4-aminobenzoate, and this can easily account for the 0.292 g difference.



Brandon Skenandore