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# Preparation of Aspirin Lab

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Introduction

The Preparation of Aspirin Lab Calculating the Percent Yield of Aspirin Mass of salicylic acid +/-0.0001 g Volume of Acetic Anhydride +/- 0.05 mL Mass of Filter Paper +/- 0.0001 g Mass of Filter Paper & Aspirin +/- 0.0001 g Mass of aspirin +/- 0.0002 g Relative Molecular Mass of Salicylic Acid +/- 0.0000 g/mol Relative Molecular Mass of Aspirin +/- 0.0000 g/mol Theoretical Yield of Aspirin +/- 0.000001 g Percent Yield of Aspirin +/- 0.0002 % 1.0167 2.08 0.6499 1.2305 0.5806 138.1216 180.1582 1.326127 43.7816 Observations: After sulfuric acid was added, the solution fumed and heat up. After all of the reactants had reacted, a colorless solution was formed. After the solution was allowed to cool down and condense, the solid product that was filtered was white and in powder form. The aqueous solution left over was colorless. Sample Calculations: Relative Molecular Mass of Salicylic Acid: Mass of carbon: 12.011 g/mol Mass of oxygen: 15.999 g/mol Mass of hydrogen: 1.0079 g/mol Mass of Salicylic acid: 7 (12.011) ...read more.

Middle

+ 6 (1.0079) = 138.1216 +/- 0.0000 g/mol Uncertainty: 0.000/12.011= 0.000 0/7 = 0.00 0 + 0 = 0 0/100 x 84.077 = 0.00 0.0000/15.999 = 0.00 0/3 = 0 0.00 + 0 = 0.00 0.00/100 x 47.997 = 0.00 0/1.0079 = 0 0/6 = 0 0 + 0 = 0.00 0.00/ 100 x 6.0474 = 0.00 0.00 + 0.00 + 0.00 = 0.0000 Relative Molecular Mass of Aspirin: Mass of carbon: 12.011 g/mol Mass of oxygen: 15.999 g/mol Mass of hydrogen: 1.0079 g/mol Mass of Aspirin: 9 (12.011) + 4 (15.999) + 8 (1.0079) = 180.1582 +/- 0.0000 g/mol Uncertainty: 0.000/12.011= 0.000 0/9 = 0.00 0 + 0 = 0 0/100 x 108.99 = 0.00 0.0000/15.999 = 0.00 0/4 = 0 0.00 + 0 = 0.00 0.00/100 x 63.996 = 0.00 0/1.0079 = 0 0/8 = 0 0 + 0 = 0.00 0.00/ 100 x 8.0632 = 0.00 0.00 + 0.00 + 0.00 = 0.0000 Theoretical Yield of Aspirin: Mass of Salicylic Acid: 1.0167 +/- 0.0001 g Relative Molecular Mass of Salicylic Acid: 138.1216 g/mol Relative Molecular Mass of Aspirin: 180.1582 g/mol Theoretical Yield: 1.0167g x (1 mol/138.1216 g) ...read more.

Conclusion

x (180.1582 g/mol) = 1.3261 +/- 0.000001 g Actual Yield of Aspirin: 1.2305 - 0.6499 = 0.5806 +/- 0.0002 g Percent Yield: (0.5806/1.326127) x 100 = 43.7816 +/- 0.0002 % 2. Material would be lost at Stage 1 in the transferring of the acetic anhydride and sulfuric acid into the flask from the graduated cylinder and pipette. In Stage 2 of the reaction, material may have been left in the flask while filtering. This could have been corrected by placing more water in the flask and filtering until all of the solid product was on the filter paper. Losses could be minimized by using apparatus in place of the flask that already has measurement on it. The apparent yield might be too large if there was any salicylic acid leftover as well as water, acetic anhydride or sulfuric acid. If there was leftover reactant such as salicylic acid, the limiting reactant, the reaction may not have come to completion due to not enough catalyst. If there was any excess water of aqueous solution in the final product, the product may not have been given enough time to drain the solution and liquid. 3. The main impurities in the sample would be salicylic acid, ethanoic anhydride and water. ...read more.

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