Part C (2): Complete the flow chart with the steps necessary to measure the abso
ID: 1021235 • Letter: P
Question
Part C (2): Complete the flow chart with the steps necessary to measure the absorbance of Fe-SA from solid aspirin.
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Mapooo Part C (2): Complete the flow chart with the steps necessary to measure the absorbance of Fe-SA from solid Transfer: 10 mL Fill to mark with 1 M NaOH to Dl water -200 mg crushed aspirin Mix well Volume? 1 mL 200 mg 5 mL DI water FeCl3 solution absorbance 1 mL lambda max Record the absorbance 50 mL in order to find the concentration mix well Fill to mark with FeCl3 solutionExplanation / Answer
The above flow chart is absolutely right, and supporting procedure check below.
1.Transfer about 200 mg (record an accurate mass) of the crushed aspirin tablet from Part Ato a clean 125mL Erlenmeyer flask. Add 10mL of 1M NaOH (aq) and heat the mixture to a gentle boil in a water bath. Rinse the walls of the flask with DI water to recover any hydrolyzed SA splattered on the walls. (Caution hot glassware.)
2. Once the solution has cooled to room temperature, transfer it to a 100mL vol. flask. Wash the walls of the Erlenmeyer flask with DI water, adding the washings to the volumetric flask. Fill the volumetric flask to the mark with DI water. Cap the flask and invert several times to mix the solution thoroughly. Allow any solid material to settle to the bottom of the flask.
3. Using the diluted solution from the 100mL volumetric flask, rinse a 1mL pipet with a few drops and then pipet exactly 1.00mL into a 50mL volumetric flask. Fill the 50mL volumetric flask to the mark with acidic FeCl3 solution. Cap and invert to mix solution. The solution should be a purple color due to the Fe3+ SA ion formed.
4. Rinse a clean, empty cuvette with a few drops of the unknown solution and then fill the cuvette about 2/3 full with the solution. Record the absorbance for your unknown at max.
5. When finished, pour the solutions in your two flasks and your cuvette into the designated waste containers in the hood labeled “Metal Containing Waste”