6.A bit of benzoic acid and benzophenone are dissolved in a small portion of dic
ID: 864316 • Letter: 6
Question
6.A bit of benzoic acid and benzophenone are dissolved in a small portion of dichloromethane. Aqueous NaHCO3 is added, the mixture shaken, and then allowed to separate into two layers. Describe what chemical substances are found in each of the layers. The dichloromethane layer is analyzed before adding the aqueous NaHCO3 (left lane) and after shaking with the aqueous solution (right lane). How do the results shown for this analysis (after developing and visualizing the plate) support, refute, or just confuse your conclusion.
7. Write a flow chart to show how you could separate a mixture of the following compounds by using acid-base extraction and then isolate each compound as a (fairly) pure substance. The technique section
Explanation / Answer
6--->Benzophenone on top. Benzoic acid would go on bottom with water (aqueous layer = bottom layer). The NaHCO3 would ionize in the water. This is because it cannot dissolve in the organic layer. And THIS is because the organic layer, though it does contain a polar carbonyl group, it does not have enough polar characteristic nor protic (meaning it does not contain hydrogens that are capable of H-bonding) enough that it dissolves the NaHCO3.
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