3 How did the melting point of your acetanilide change after recrystallization

3 how did the melting point of your acetanilide

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3. How did the melting point of your acetanilide change after recrystallization? a. The melting point of our acetanilide was a bit on the lower side of the intended value. This can be due to human error or the sample was not dry enough when measured. 4. Why could you test the purity of your acetanilide by mixing it with a known, pure sample of acetanilide and rechecking the m. p.? a. When comparing the purity of acetanilide against the produced acetanilide, you should not have any variance. The melting points should not vary. If there is a variance, it could mean that the produced was not accurate or the produced is not pure enough and recrystallization is needed again. 5. Why must the funnel be heated before the hot acetanilide solution is filtered? a. A cool funnel could cause premature crystallization, which could clog the funnel. 6. What purpose does adding activated charcoal during recrystallization serve? a. Per the instructor, we did not use Activated Charcoal. Instead, we used sand and salt. The sand and salt served as a way to make the pure acetanilide. 7. What is the difference between percent recovery and percent yield? a. Percent recovery deals with recrystallization while percent yield refers to reactions. 8. Melting “point” is a misleading term. Why? a. Melting point is a misleading term because the melting point is dependent on both the amount pressure and heat applied therefore, you could be talking about several things that is affecting the melting point. It’s not accurate. References: Shanbhag, and Veliz. “Recrystallization and Melting Point Determination” Nova Southeastern University, 2012, pp. 24-25 3
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