Directions: Please answer the following questions and exercises correctly. The b

Question

Directions: Please answer the following questions and exercises correctly. The balanced reaction for the acctylation of salicylic acid is shown above The products arc aspirin (acetylsalicylic acid) and acetic acid (a) Determine the theoretical yield and of aspirin for this reaction if you begin with 2 54 g of salicylic acid and 6 8 ml. of acetic anhydride (b) Determine the percent yield if you obtained 1.97 g of aspirin as your final product. SHOW ALL YOUR WORK'!!! Which of the three circled functional groups of salicylic acid shown below will give rise to a positive "ferric chloride" test? Can you suggest one reason why the MP of aspirin is lower than that of salicylic acid? Please explain. .

Explanation / Answer

salicylic acid moles = 2.54/138.12 = 0.0184,

anahydride moles = (6.8 x1.082/102.09) = 0.0721,

salicylic acid is limiting reagent

moles of aspirin = 0.0184 ,

aspirin theoretical yield = 0.0184 x 180.6 = 3.315 gm

b) % yiled = 1.97 x100/3.315 = 59.43 %

2) phenol OH group gives FeCL3 test

3) in salicylic acid OH and COOH are adjacent and give styronger interactions compared to aspirin COOH and COCH3 groups hence higher MP for salicylic acid

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