Need help with these questions. Answer plz be detailed!!! THX!!! Your prepared a

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Need help with these questions. Answer plz be detailed!!! THX!!!

Your prepared aspirin probably gave a positive test for phenol How can this be explained? The aspirin structure contains a phenol group. It is contaminated with salicylic acid. It is contaminated with acetic anhydride. It is contaminated with sulfuric acid. Explain your answer: Suppose in Step 10 of Part A, a student washed the solid aspirin with hot water instead of ice water. How would this influence the percentage yield of the isolated aspirin compared to that obtained if ice water had been used? Increase it. Decrease it. Would not influence it. Explain your answer: Suppose in step 12 of part A, a student suspended the synthesized aspirin using hot water instead of ice water. How would this influence the percentage yield of the isolated aspirin compared to that obtained if ice water had been used? Increase it. Decrease it. Would not influence it. Explain your answer: What is the correct formula for the ester produced when ethyl alcohol, is reacted with butyric acid Explain your answer: Which of the following is a use that could probably be made of all esters prepared in Part D? Coloring agents Flavoring agents Analgesics Explain your answer:

Explanation / Answer

1) option b

Aspirin can be hydrolysed by moisture to give salicylic acid and ethanoic acid. The phenolic OH is regenerated on the product salicylic acid and a positive test occurs.

Salicylic acid has a carboxyl group and a hydroxyl group.

2) option a (increases it)

oil impurities are removed treating with hot water so % of aspirin increases

3) option b ( decreases it)

as impurities stay back yield will be reduced

4) option c

ethyl butyrate

5) option b

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