LAB 6 – SYNTHESIS OF ASPIRIN The Synthesis of Aspirin Record the weight of your aspirin and calculate the percentage yie

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LAB 6 – SYNTHESIS OF ASPIRIN
The Synthesis of Aspirin
Record the weight of your aspirin and calculate the percentage yield.
Weight of Aspirin________2.23___________________g
Yield of Aspirin_____________________________%
Computations: Show your work and include units.
Determine the mass of salicylic acid by difference or tare weight.
2.025g
Compute the mass of acetic anhydride from its volume and density.
5.00ml * 108g/ml = 5.4g
Compute the moles of salicylic acid and acetic anhydride.
0.0145 moles of salicylic acid
0.0259 moles of acetic anhydride
Compute the actual molar ratio of salicylic acid: acetic anhydride.
1:1
Determine the limiting reagent. salicylic acid
Compute the theoretical yield.
0.0145mol * 180g/mol = 2.61 g
Determine the mass of the aspirin product by difference.
Compute the percent (%) yield from the product mass and the theoretical yield.
Lab 6 - Analysis and Conclusions:
1. Discuss why the yield was not 100%:
2. Compare the colors in the three tests from the ferric chloride test. Explain your results.
What was the color of the salicylic acid-iron(III) chloride test solution?
Aspirin Synthesis Data
Mass Salicylic Acid: 2.025
Volume Acetic Anhydride: 5.00ml
Mass Final Product:
Calculations:
Salicylic acid (moles)
Acetic anhydride (moles)
Theoretical Yield (g)
% Yield
0.0145
0.0529
Synthesis of Aspirin Results Summary Table:
Show calculations where applicable:
Reagent Mass Volume Density Calculation
Salicylic acid =______________g
Acetic anhydride _______mL _______g/mL =______________g
Moles
Salicylic acid
Acetic anhydride
Molar Ratio Stoichiometric Actual Ratio (show calculation)
Salicyclic acid = __________
Acetic acid
Limiting Reagent:
Theoretical Yield:
Actual Yield:
Percent Yield: