Organic chemistry: how to determine whether the product was pure with melting po

Question

Organic chemistry: how to determine whether the product was pure with melting point? Observed MP was 199.9-210.6 degrees C. Whereas the literature MP of compound A was 204 degrees C, MP of compound B was 95 degrees C. 1. Which product do you have? Compound A or compound B? 2. Determine whether the obtained product was pure or impure. 3. Explain why the product was considered pure or impure. Thank you all for answering. I need to know these answers as the lab practical on melting point experiment is up next week!

Explanation / Answer

When a compound is pure, its observed melting point is sharp and is approximately equal to the literature value of

the melting point of the pure sample. However if the compound is impure, its observed melting point is broad its

value is significantly different from the literature value of the melting point of pure sample.
1) Observed MP was 199.9-210.6 degrees C. Whereas the literature MP of compound A was 204 degrees C, MP of compound B was 95 degrees C. The obseved value of melting point is close to the literature value of compound A. Hence, the product is compound A.
2) and 3) Since the obseved value of the melting point is broad and significantly different from the literature value, the product is impure.

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