From the results of the melting point of the AE1, the identity of the unknown is 2-chlorobenzoic acid. The melting point for this compound was 143 degrees celsius and in the experiment protocol it is 142 degrees celsius. The less than two degree difference reaffirms that it was a pure compound. The percent recovery could be caused by human error. During the extraction and filtration, the solution possibly did not become fully acidic by HCl before being left to cool, which would affect the product’s ability to recrystallize. This reasoning could also apply to the OL1 recovery rate of 77.87%. The percentage could be due to a lack of acidity or it could be caused by the CaCl2 and NaHCO3 being unable to fully separate the compound from the solvent ether. It would affect the amount of solute able to recrystallize and would further affect the recovery rate. The melting point of benzil was 95-96 degrees celsius, which is in the range, therefore the compound is pure. The purified melting point reaffirms that the crystals were successfully purified because the melting point has less than a 2 degree celsius difference. The identity of compound AE1 is 2-chlorobenzoic acid and the identity of the compound in OL1 mixture is benzil.
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