Acid Base Extraction 1. There were 1.618 grams of benzoic acid recovered, 0.145 grams of ethyl 4-aminobenzoate, and 0.645 grams of anthracene. The original total mass of the compound was 4.03 grams, so the percent recovery for benzoic acid was 40.1%, 3.6% ethyl 4-aminobenzoate, and 16.0% anthracene. These percentages only equal about 60%, so the combined final masses do not equal the starting mass. Some of the compound could have been lost during the vacuum filtration, as the compound could have gotten below the filter paper so all the crystals may not have been obtained from the compound. Human error could have also contributed, as crystals may have been dropped during transfer for weighing. Some mass could have also been evaporated. 2. Ethyl 4-aminobenzoate was not completely pure, but based on its melting point, which was 87.6°-89.0°C compared to the theoretical 89.0°-92°C, we can say that it was fairly pure with a few impurities. Benzoic acid was even less pure, and this is known because it had a wide range
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