Name Preparation of Aspirin Class & Section POST-LABORATORY QUESTIONS A student

Question

Name Preparation of Aspirin Class & Section POST-LABORATORY QUESTIONS A student performing this experiment missed the amount of acetic anhydride and added 0.4 ml instead of 4.0 ml of acetic anhydride. Did this procedural error affect the theoretical yield of her preparation? Explain. 1. A student noticed that after drying the aspirin for a week in his drawer, the aspirin crystals appeared to be dry but the filter paper was still damp. He went ahead and performed the weighing as directed in the procedure. Did the damp filter paper affect any of the following? In each case, briefly explain your answer. 2. a. theoretical yield b. calculated actual yield c. calculated percent yield Preparation of Aspirin

Explanation / Answer

1. Aspirin is formed when Salicylic acid reacts with excess of acetic anhydride in presence of acid as a catalyst, thus in this case, salicylic acid will be limiting agent. But when acetic anhydride is used in appreciable lower amount, then it would be the limiting reagent, and lower amount of acetic anhydride then affect and lower the yield of product aspirin.

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