Lab_2_Aspirin_lab[1]

Lab_2_Aspirin_lab[1] - Aspirin Synthesis & Analysis March...

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March 5 th , 2008 Lab Section 2216 Chemistry 002 Yunyun Wu Rebecca Dermody
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I. Purpose: The purpose of this lab was to synthesize and standardize an aspirin sample that contained an unknown amount of pure aspirin. Through several different techniques, the percent yield of pure aspirin in the sample was found. II. Procedure: Week 1 - Part I 1. Weigh 2.154 g salicylic acid and transfer to 150 mm test tube 2. Add 4 mL acetic anhydride to test tube 3. Add 5 drops of concentrated sulfuric acid 4. Place test tube in boiling water bath for 20 minutes 5. Fill 250 mL beaker with 20 mL water and several ice cubs 6. Remove previously made test tube from water bath and pour into ice water 7. Cool sample until solid white forms 8. Turn on aspirator, moisten filter paper, filter reaction 9. Rinse beaker with 15 mL chilled deionized water 10.Remove dried aspirin from aspirator and store in beaker Part II 1. Label 3 test tubes as follows: salicylic acid, pure aspirin, aspirin product 2. 3 to each test tube 3. Add a few crystals of salicylic acid, pure aspirin, and product to corresponding test tubes 4. Observe and record the color of the solutions Part III 1. Fill buret with NaOH and drain 5 mL, record starting volume 2. Weigh about .500g KHP and record mass 3. Add KHP to 125 mL flask 4. Add 20-40 mL distilled water 5. Add 3 drops phenolphalein 6. Titrate KHP solution with NaOH 7. Repeat steps 2-6 two more times 8. Calculate molarity of NaOH Week II - Part I 1. Weigh dried aspirin sample extracted in week 1 2. Determine percent yield
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Part II 1. Weigh 15-30 mg aspirin and record mass before adding to 100 mL flask 2. Add 10 mL ethanol and mix 3. Dilute with deionized water to mark on flask 4. Repeat steps 1-3 with aspirin sample 5. Repeat steps 1-3 with salicylic acid 6. Pipet 10 mL aspirin solution into test tube 7. Add 8 mL .100M FeCl
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This lab report was uploaded on 04/11/2008 for the course CHEM 2 taught by Professor Ryan during the Spring '08 term at Marquette.

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Lab_2_Aspirin_lab[1] - Aspirin Synthesis & Analysis March...

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