her are my results from my lab: please anser the following : Theoretical yield:

Question

her are my results from my lab:

please anser the following :

Theoretical yield: Mass of 50-mL beaker Mass of your aspirin and beaker Mass of your aspirin: (3) - (2) Percent yield: [(4)/(1)] times 100 = % Iron(III) chloride lest The experiment required 3 drops of concentrated sulfuric acid. Why was this acid added? Would the reaction take place if this reagent were omitted? A student thought he carefully followed the directions in the experimental procedure, and he expected 2.63 g of product. However, he isolated 3.05 g of product. What would account for the excess mass? The above student also found that his product tested positive with 1% iron(III) chloride solution. What does this test indicate? Another student also expected 2.63 g of product, but isolated only 2.45 g. What is the percentage yield? Show your work Below are structures of common aspirin substitutes. Why do ibuprofen and naproxen not give a positive test with 1% iron(III) chloride? Why does acetaminophen give a positive test? Bottles containing old aspirin tablets often smell of vinegar. The presence of what chemical causes this smell? How does this chemical form? You may have observed that not all of the commercial aspirin dissolved in the added water. What would account for the undissolved material?

Explanation / Answer

2) In this reaction acetic acid is the byproduct which is boiling point is 121 oC. so we need to remove this if it is present along with product. this could be the reason for excess weight.

3)Iron III chloride combines with the phenol group to form a purple complex. so it indicates unreacted salicylic acid is present in the product.

4) yield = 2.45/2.63*100 = 93.1% yield

5)Iron III chloride combines with the phenol group to form a purple complex. so phenol group is absent in ibuprofen and neproxen so they will not give positive test

6)aspirin often smell like vinegar because aspirin can decompose through hydrolysis in moist conditions, yielding salicylic and acetic acids. acetic acid smell will be like vinegar

7) Salicylic acid is NOT water soluble. so decomposed one product Salicylic acid is present in the commercial

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