Spectrophotometric Determination of Aspirin
Taylor Warinner-Calixto
Heather Allen
Chem 112L 008
2/2/16
Research Questions:
1.What is the amount of pure aspirin in the aspirin tablets made by Bayer and Kroger?
Calculations:Y=4965.8x+0.4174Bayer: 0.748=4965.8x+0.4174X= 0.000665754 g/mL0.0000665754 g/mL x 100mL = 0.00665754 g of aspirin0.00665754 g x 50 = .33287688 total grams of aspirin in each tablet(.33287688/.396)x100=84.06%Kroger:0.752=4965.8x+0.4147X=0.0000673809g/mL0.0000673809g/mL x 100 mL = 0.00673809 g of aspirin0.00673809 x 50 = .336904425 total grams of aspirin in each tablet(.336904424/.367)x100 = 91.8%Claims:We can claim that as the concentration of aspirin in a solution goes up the absorbance of that solution will go up as well. After testing the absorbance of both Kroger and Bayer and doing calculations we were able to claim that Kroger had a higher percentage of pure aspirin.Evidence:The ultimate goal of this lab was to determine the amount of pure aspirin in the store brand aspirin tablet. To this we first needed to create a standard curve line. In order to do this we created 6 different solutions. Each solution had a different about of pure aspirin in them. We then took these different solutions and tested them in the Spectrometer. The spectrometer determined the absorbance of each solution. We then put this into excel and got an equation to determine concentration. To test each store brand tablet we first recorded the total mass to use later when finding out the percentage of aspirin. We then diluted the aspirin into a 250.00 mL volumetric flask so make a testable solution. We