Calculate the number of moles of acetic anhydride present in the reaction mixture, using a modification of Equation 2. B
Posted: Fri Apr 29, 2022 12:39 pm
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1. Preparing Aspirin mass of weighing paper 8 mass of salicylic acid plus weighing paper, 8 volume of acetic anhydride added, mL 7.42 3.62 5mL D.2017 30.694 31.2607 mass of filter paper. 8 mass of watch glass, & mass of watch glans, filter paper, and crystals, 8 II. Treating the Discarded Solutions for Disposal color of discarded solutions mixture immediately after addition of phenolphthalein solution yellow name and molarity of solution used to neutralize discarded solutions mixture yellow
Example Problem Calculate the percent yield if 1.963 g of aspirin is produced from 2.198 g of salicylic acid and 4.0 mL of acetic anhydride. Solution (1) Calculate the member of moles of salicylic acid present in the reaction mixture, using Equation 2 (Eq. 2) number of moles of salicylic acid, mol = (mass of salicylic acid, g) (138.12 g salicylic acid 1 mol salicylic acid = (2.198 g salicylic acid) 1 mol salicylic acid (138.12 g salicylic acid = 1.591 x 10-7 mol (2) Calculate the mass of acetic anhydride used, using Equation 3. The density of acetic anhydride is 1.082 g/mL.. -(acetic m) (ace (Eq. 3) mass of acetic anhydride 8= volume of density of acetic anhydride, m acetic anhydride, g/ml. = (4.0 mL.) (1.082 =438 1730 ml (3) Calculate the number of moles of acetic anidride present in the reaction mixture, using a modification of Equation 2. The molar mass of acetic altydride is 102.09 g/mol. number of moles of acetic anhydride, mol (4.3 g acetic anhydride) = 4.2 x 10-? mol 1 mol acetic anhydride 102.09 g acetic anhydride (4) Based on the number of moles of aach rargent present and the stoichiometry of the reaction, determine the limiting renciant for this preparation Salicylic acid is the limiting reactant. (5) Calculate the theoretical yield for this preparation, based on the number of moles of limiting reactant present and Equation 4. The molar mass of aspirin is 180.75 g/mol. 1) 6 mol ) (Eq. 4) theoretical yield, & * number of moles of limiting reactant, mol (1.591 x 10-mol salicylic acid 1 mol salicylic acid 1 mol aspirin (180.15 g aspirin 1 mol aspirin 1 mol aspirin 1760.15 g aspirin 8 1 mol aspirin ne) 2.866 g