Question

- OF ASPIRIN ANU UN riment Exercise 7: The Yield of Aspirin Name Date Pred the el the st Read Exercise 7 in your lab manual. Complete the Pre-lab Assignment In this substitute lab exercise, you will watch a short video on preparing aspirin. The videos posted on the course Moodle page, and it provides the masses of the reactants and the product; you should be able to calculate the theoretical yield and the yield from the data given by the video. Submit the completed assignment by March 25, 11:55 pm 1. Write the chemical equation for the formation of aspirin from salicylic acid and acetic anhydride. Show the condensed structural formulas of all reactants and products. Sulfuric! acid is a catalyst for this reactions you do not need to show the structure of sulfuric acid) culate licylic pirin 1. mas 2. Calculate the molar masses of the following compounds. Record the mass of salicylic acid used and the mass of aspirin obtained in the video. Use the molecular masses to calculate the moles of each: Amount mol salicylic acid acetic anhydride 0.0423 mol filter paper Molar Mass Mass D g/mol 2.027 8 g/mol 4.00 ml No data 1.354 & No data 2.711 8 g/mol 2.357 filter paper No data 2544 Aspirin + filter paper No data Aspirin mol Show the calculation for the number of moles of salicylic acid and of aspirin here: 3. Based on the data above and the balanced equation, which reactant is the limiting reagent?

Answer 1

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#1. Balanced chemical equation for preparation of Aspising OH O-C-CH3 0 Scott condolenza Cool Ho Sou o chy-t-on + CH₃-C-0-C-CH3 ol & CH3-(-OH salicylic acid Acetic anhydride Aspirin Acetic acid I mol of salicylic acid reats with 1 mol of acetic anhydride to give, Imol of aspirin. #2 2. Name Name Molar mass Mars (9) Amount (Mass/molar mass) (almol) 2.027% = 0.0147 mol Salicylicacio acetic ante dyide 138.12g/mol 102.09 g/mol 2.0279 yoomL 138.12g/mol 0.0423mol filter paper .354g Aspirin + paper 2.711g Aspisin 180g/mol 2.3579 2.3579 180g1m = 0.013 1 mol #3. As moles of salicylic and are less than moles of acetic anhydride Stoichiometrically. This Salicylic acid is the limiting reagent.