Synthesis OF Aspirin-1 PDF

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EXPERIMENT: ASPIRIN SYNTHESIS LAB REPORT NAME Leilani Arias___________

DATE ___________________

INSTRUCTOR Sharon Fischer______

SECTION_________________

Mass of salicylic acid (g)

2.015 g

Moles of salicylic acid (4 points)

0.015 moles

Volume of acetic anhydride (mL)

3.0 mL

Mass of acetic anhydride (g) (4 points)

3.0 g

Moles of acetic anhydride (4 points)

0.0293 g

Mass of dry filter paper (g)

0.276 g

Mass of filter paper and aspirin (g)

2.548 g

Mass of Aspirin (g) (2 points)

2.308 g

Theoretical yield of aspirin (g) (8 points)

2.745 g

Actual yield of aspirin (g) (2 points)

2.402 g

Percent Yield of aspirin (g) (5 points)

80.4%

Color of salicylic acid plus 1% FeCl3

Dark Purple

Color of commercial aspirin plus 1% FeCl3

Light Purple

Color of synthesized aspirin plus 1% FeCl3

Purple

Show calculations for theoretical yield and percent yield to earn the full points indicated on the table. Theoretical yield: (2 points) (2.105 g sac. acid) x 1 mol. sac acid. x 138 g sac. acid. Percent yield:(2 points)

1 mol aspirin x 180 g aspirin 1 mol sac. acid.

1 mol aspirin

(mass of aspirin in glass) – (mass of glass)= actual yield 95.792-93.39= 2.402 %yield= actual/ theoretical x100 % yield = (2.402)/(2.745) % yield= 80.4% 1. Calculate the % error (4 points, show work):

% error = (2.402-2.745)/(2.402)= 14.2% error

2. State two sources of error that may have led to the % error in #1 above (4 points):

I measured the empty flask after I finished the experiment. I was told to start 10-minute timer late resulting in in accurate telling of when to take flask out. The solid salicylic acid might not have dissolved completely.

3. Explain why it was important to use very cold water to rinse the aspirin crystals. (3 points) The importance of using very cold water is because it is less soluble in cold water. The cold water prevents it from dissolving too much so that you have a more accurate yield of your product. The rinsing is meant to take out any products that do dissolve in water. 4. Based on the results of the FeCl3 test, is your final aspirin product pure or not pure? (2 points) Based on the results of the FeCl3 test, my final product was pure

5. Explain your answer to #4 above (4 points):

My final product was pure because when the indicator was added, it resembled the purple of the salicylic acid and the commercial aspirin....