Benzoic Acid Experiment
-Explanation/Interpretations-
When we added 35ml of 10% aqueous hydroxide acid into 2 Erlenmeyer flasks (Experiment 1), the certain change was shown only in the first flask, which indicated that almost benzoic acid was drawn at first.
Raw product weight, which was obtained from the experiment 1, was changed slightly when we checked it 1 week after first experiment. I have thought that during 1 week, because we kept the product in the bottle, there would be any change or absorption of something there.
We have figured out that after extraction with filtration apparatus, we didn’t remove moisture totally or there would some impurities. Because, the raw product has lower melting point range (120.1℃~122.1℃) than the benzoic acid standard (120.6℃~123.2℃).
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However, compared with only recrystallized product, its melting point range was slightly higher and narrower. Because recrystallized product, which we made contained lots of water and was more impure than benzoic acid standard, was contained less in the mixture of recrystallized and benzoic acid standard, we could conclude that the mixture of them was purer than only recrystallized product. This was why the mixture of them had higher and narrower than only recrystallized …show more content…
The reason was that after we poured the solution with recrystallized product into the Buchner funnel, we used some water in order to wash the remain on the flask. At first, we didn’t recognize that some water we used was not very cold so that it made some precipitate dissolved again. After we realized this situation, we made water cold and used cold water to wash. In this process, loss of recrystallized precipitate would occur in some degree. In order to improve this problem, we had to use cold water to wash the remain on the flask from the beginning.
Last, we got a somewhat inaccurate melting point range., especially measuring benzoic acid standard. In terms of this error, there were 2 main mistakes that I totally forgot taking caution. First, we had to make crystals packed more tightly in the capillary. Because when we used digital melting point apparatus, we found out that there were some air spaces in the certain capillary. It made the melting point have generally wide range. Second, we increased the digital melting point’s temperature by 3℃, it would be better when we increased by
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