Spectrophotometric Analysis of Aspirin lab report.pdf -...

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Thanh Nguyen Chemistry II Lab: Spectrophotometric Analysis of Aspirin Table B: Mass of pure aspirin: .160 g Moles of aspirin: .160 g aspirin 1 ??? 180.2 𝑔 𝑎??𝑖?𝑖? = 8.88 x10 -4 mol aspirin Concentration of aspirin in stock solution, M: 8.88x10 -4 mol /0.1 L = 8.88x10 -3 M Beer’s law plot: Solution Concentration, M (x10^4) %T Absorbance A 4.44E-04 36.2 0.442 B 3.55E-04 41.6 0.382 C 2.66E-04 47.8 0.321 D 1.77E-04 58.6 0.232 E 8.88E-05 75.6 0.120 Unknown 3.85E-04 39.2 0.408 Dillution of stock solution and Absorbance Determination Unknown y = 896x + 0.0612 R² = 0.9819 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.00E+00 1.00E-04 2.00E-04 3.00E-04 4.00E-04 5.00E-04 Absorbance Concentration, M Beer's law plot for Aspirin