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29.8699 Ⓒ -07- Analysis of Aspirin and Other Analgesics - Thin Layer Chromatography You have been assigned the unknown number 4 Enter your unknown number: (1pts) Aspirin Collection - Vacuum Filtration, Contd.. 29.869
(1pts) Mass of watchglass dried aspirin product (g). 32.249 -O/T- 32:249
(19pts) Calculation of Yields Mass of Erlenmeyer flask + salicylic acid: Mass of empty Erlenmeyer flask (1pts) Mass of salicylic acid used (g) (2pts) Moles of salicylic acid (mol) Volume of acetic anhydride (2pts) Moles of acetic anhydride (mol) note the density of acetic anhydride is 1.00 g/ml (2pts) What is the limiting reactant? 2,38 Choose 99.978 g 87.973 9 5.10 mL
Mass of empty watchglass (1pts) Mass of aspirin obtained (g) (2pts) Moles of aspirin obtained (mol) (3pts) Aspirin theoretical yield (g) (2pts) Product percent yield (4pts) is your percent yield within reason of what you would expect? Explain your answer Normal BIU MIR& IT111 29.869 9
pH Test From the procedure 1. Obtain 4 test tubes and a test tube rack 2. Add the following to the specified test tubes 1.3 mL of 0.15% salicylic acid (reference sample) 2. A spatula tip of crushed commercial aspirin and 3 mL of water 3. A spatula tip of crushed buffered aspirin and 3 mL of water 4. A spatula tip of your aspirin product and 3 mL of water 3. Stir each solution with a stirring rod. 4. Measure each solution's pH using pH paper and record, Inspect the following images, making observations about the pH of each Virtual pH Paper Key 0 1 Virtual ni Torte 2 3 5 6 4 ‒‒‒ 7 8 9 10 11 12 13
Result 0.15% salicylic acid Commercial aspirin Buffered aspirin Using your observations about the pH paper, estimate the pH of each sample to the nearest pH unit Iron(III) Chloride Test Aspirin product From the procedure 5. To each test tube from the pH Test, add 5 drops of 1% FeCl3. Free salicylic acid reacts with the FeCly to produce a purple color. The higher the amount of salicylic acid, the deeper the purple color 6. Record the colors of each aspirin product 7. Compare the purity of each aspirin product to the reference sample and record
Inspect the following images, making observations about the presence of salicylic acid in each sample. Virtual FeCl, Tests: Result 0.15% Salicylic acid Commercial Aspirin Buffered Aspirin Aspirin Product Use the observations you have made to complete the following table, Recall that free salicylic acid reacts with the FeCl, to produce a purple color Select the option from the 'Observation column that best matches your observation
pH and Iron(III) chloride test results Salicylic acid Commercial aspirin Buffered aspirin Aspirin product Normal 1 BIU PH BEL FeCl, Test Observations Choose Choose Chose Choose... Chiese Choose Choose Choose... (2pts) What does FeCl, react with to produce a positive result? What information does the iron(III) chloride test provide? 180 Is Salicyclic acid present? IT Choose Choose Choose Choos Choose Cho Choose
What do the results of these tests tell you about the purity of Normal : BIU Commercial aspir Buffered as Your synthesized aspirin XX 183 & 187 BETR T.
The image shown below represents a TLC was prepared according to the procedure above. The lanes on the TLC are labelled as follows. 1. Aspirin 2. Ibuprofen 3. Acetominophen 4. Naproxen 5. Caffeine 6. Unknown over the counter medication After developing the TLC plate, the solvent front was marked with a pencil and it was placed under a UV light. The background of the plate fluoresces green with compounds that absorb UV light appearing as darker spots. The spots are circled with a pencil Use the following image to measure the distance traveled by the solvent and by each of the spots Virtual TLC
+ 1 + 2 + 3 4 5 6 -5 -3 -2 -1
Complete the following table with your measurements and calculate the R, of each spot. Report distances to at least the nearest 0.1 cm. Note: Your unknown sample may contain one, two, or three analgesics . If your sample only has one spot, enter it in the row for the lower or only spot." • If your sample has two or more spots, the lower spot (that did not travel as far) is listed first and the upper spot (which traveled the furthest) is listed last • If a there are more entries than needed for your unknown sample, enter zero for the excess distance traveled and R, entries. Do NOT leave them blank (1pts) Enter the distance the solvent travelled (cm)
Lane #1: Aspirin Lane #2: Ibuprofen Lane #3: Acetaminophen Lane 4: Naproxen Lane #5: Caffeine Lane #6: Unknown 4 Lower or only spot smallest distance traveled if multiple Middle spot (enter zero if none present) Upper spot (enter zero if none present) largest distance traveled if multiple Distance spot traveled (cm)
Based upon the TLC analysis, what is the likely most identity of each spot in Unknown 47 (2pts) Lower or only spot (smallest distance traveled if multiple) (2pts) Middle spot (2pts) Upper spot (largest distance traveled if multiple) (1pts) which brand of OTC pain reliever best matches the composition of unknown 47 Choose Choose Choose... Choose