Essay on Beers Law

883 WordsJul 8, 20134 Pages
Purpose The purpose of this experiment is to apply Beer’s Law by analyzing samples provided by Q laboratory to determine their absorbance and prepare a Beer’s law plot. Molarity of these samples was also calculated to determine concentration and percent error rate. Students also analyzed the concentration of blue dye #1 to determine the concentration of blue dye #1 in a commercial blue dye drink. Procedure Exercise #1 Step #1: Convert %T (Table 1) to absorbance and prepare a Beer’s law plot using the data. Step #2: Determine the concentration of M of the samples in table 2: A=ebc A= 2-log(%t) B= 1.0 cm Solve for E E=1875 (0.36) / (1875*1) = 1.92 x 10-4 m/L Molarity…show more content…
Step #8: Slide well along previous one to compare color. Find a well that matches the color of the commercial drink best. Step #9: After matching the well record the approximate concentration of blue dye #1 in the product. Step #10:After matching the diluted product with the standard strip, multiply by the dilution factor to obtain the correct concentration. Step #11: Clean up all materials Observations and Results Exercise #1 Concentration of Various Samples | Sample IdentificationCode | Concentration of M(mol/L) | %t | A = 2 - log(%t) | Q5000 | 4.00 x 10-4 | 17.9 | 0.747146969 | Q5001 | 3.20 x 10-4 | 25.0 | 0.6020599913 | Q5002 | 2.40 x 10-4 | 35.7 | 0.4473317839 | Q5003 | 1.60 x 10-4 | 50.2 | 0.2992962829 | Q5004 | 8.000 x 10-5 | 70.8 | 0.1499667423 | Concentration of M | Sample IdentificationCode | %t | A = 2 - log(%t) | A | M | Q021015-01 | 43.7 | 0.35951856 | 0.36 | 0.000192 | Q021015-02 | 44.1 | 0.35556141 | 0.36 | 0.000192 | Q021015-03 | 43.8 | 0.35852589 | 0.36 | 0.000192 | Q021015-04 | 44.1 | 0.35556141 | 0.36 | 0.000192 | Q021015-05 | 43.8 | 0.35852589 | 0.36 | 0.000192 | Percent Error: 3.0 X 10-4 – 1.92 X 10-4 X 100 = 36% 3.0 X 10-4 Their percent error rate is 36 % Exercise #2 Data Table 1: Concentrations of Blue Dye | Well # | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Drops of Blue Dye Solution | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Drops of Distilled Water | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2
Open Document