Preparation of Aspirin and TLC Analysis Name Class &Section; POST-LABORATORY QUE

Question

Preparation of Aspirin and TLC Analysis Name 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. 2. 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. a. theoretical yield b. calculated actual yield c. calculated percent yield Preparation of Aspirin and TLC Analysis Page 89

Explanation / Answer

Yes, the mistake in adding the required amount of any reactant has a chance to impact the theoretical yield. However, it would also depend on the stoichiometry of the chemical reaction involved here.

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