5) why did the procedure direct you to isolate the acetaminophen and acetylsalic

Question

5) why did the procedure direct you to isolate the acetaminophen and acetylsalicylic acid crystals by vacuum filtration rather than a simple gravity filtration?

7) the flavor of grapes is partly due to the compound methyl anthracite, shown below. suppose you soaked grapes in ethyl acetate in order to extract their flavoring agents. what type of solvent night you use to extract the methyl anthranilate from the other compounds in the ethyl acetate solution? to justify your answer, draw the structure of the compound produced when methyl anthranilate is exposed to the extraction solvent you choose.

Explanation / Answer

5) Vacuum filtrate is chosen over gravity filtration for two reasons:

a) Vacuum filtration works faster that gravity filtration. In vacuum filtration, the solvent is expelled under reduced pressure which forces the solvent quickly through the filter paper leaving behind the residue on the paper. Gravity filtration works under normal atmospheric pressure and takes a longer time.

b) The more important reason is related to loss of the materials. In gravity filtration, the rinse solvent remains in contact with the crystals for a longer period of time (since the process is slow) and thus the crystals have more time to solubilize in the rinse solvent and can be lost. In vacuum filtration, the rinse solvent is quickly expelled from the filter paper leading to no appreciable loss of materials.

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