chem233_postlab1 - Section AB3 TA Joel Melby 1a The percent...

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Section: AB3 TA: Joel Melby 1a. The percent recovery for both benzoic acid and naphthalene were below 100%. 1b. 100% recovery would mean that the initial sample was either already pure or that the recrystallization did not take any impurities out and it is as pure/impure as it originally was. 1c. A recovery under 100% indicates that impurities were taken out of the original sample and nothing was added, which means the sample is more pure than it originally was. 1d. A recovery over 100% indicates that the sample has become less pure, as more impurities were added throughout the recrystallization process. 2a. The melting for benzoic acid that we obtained from our purified sample was 120.9-124.5°C, which almost exactly matches the literature melting point of 121-125°C. This correlation indicates that our lab sample was highly pure, as a lack of impurities allowed it to melt at the correct temperature. More impurities would have caused the range to be wider and the melting point to be different, but this was not the case as our sample was competently purified.
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