What data did you collect to indicate that you produced aspirin? What did your r

Question

What data did you collect to indicate that you produced aspirin? What did your results indicate about the purity of the aspirin you obtained? Explain your answers. Given that the melting point acid is 159 degree C, can you be certain that the product you isolated was not pure salicylic acid that was of salicylic be that the product you was unchanged during the reaction? Can you not impure salicylic acid? Explain answers using your data. Was your percent yield of aspirin exactly 100%? If not. give reasons why your yield was greater or less than 100%. Why did the procedure direct you to isolate your aspirin crystals using suction filtration (with a vacuum) rather the simply using gravity filtration (with no vacuum)?

Explanation / Answer

1. A melting point check of the product can predict the formation of the product. If you see melting point 135oC , this means that Aspirin has formed.

2. A mixture has a lower melting point than a pure substance. If you see the melting point less than 159oC for example 154oC, it suggest that the product is impure unchanged salicylic acid. A value close to 159oC will suggest a pure salicylic acid.

3. Yiels of the reaction is not 100% due to side reactions.

4. A crystal is the purest substance. Thats's why the precedure ask you to separate the pure crystals and not just the solid which could be a mixture of aspirin + starting materials.

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