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Beer law

# Beer law - Beer's Law By Robert Pelini Date of Lab Date...

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Beer’s Law By: Robert Pelini Date of Lab: 4/10/08 Date Submitted: 4/17/08 Partners: Paul K,

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Data: Wavelength = 770 nm Sample # Approx mL of stock in 100 mL flask Initial Buret (mL) Final Buret (mL) Actual mL used Calc. Conc. (M) %T Absorbance 1 1 0 1.01 1.01 .0101 79.3 .101 2 2 1.01 3.01 2.0 .0221 60.2 .254 3 3 3.01 6.01 3.0 .0297 44.8 .296 4 4 3.01 10.0 3.99 .0393 35.1 .447 5 5 10.0 15.0 5.0 .0517 25.8 .538 6 6 15.0 21.0 6.0 .0600 19.0 .747 7 7 21.0 28.0 7.00 .0700 14.2 .790 8 8 28.0 35.01 8.01 .0798 14.6 .907 9 9 35.01 44.0 8.99 .0918 8.5 .983 10 12 44.0 56.0 12.0 .1170 3.7 1.32 11 15 56.0 71.0 15.0 .1510 1.7 1.72 12 18 71.0 89.0 18.0 .1810 0.8 2.00 13 20 89.0 109.0 20.00 .2000 0.3 2.05 14 x x x x .3000 0.0 3.00 15 x x x x .5000 0.0 3.00 16 x x x x .7500 0.0 3.00 Calculations: M1V1= M2V2 A = -log(%T/100) 1 x 1.01/ 100 = .0101 M -log (79.3/100) = .101 1 x 2.01/ 100 = .0201 M -log (55.7/100) = .254 1 x 2.97/ 100 = .0297 M -log (50.6/100) = .296 1 x 3.93/ 100 = .0393 M -log (35.7/100) = .447 1 x 5.17/ 100 = .0517 M -log (29/100) = .538 1 x 6.00/ 100 = .0600 M -log (17.9/100) = .747
1 x 7.00/ 100 = .0700 M -log (16.2/100) = .790 1 x 7.98/ 100 = .0798 M -log (12.4/100) = .907 1 x 9.18/ 100 = .0918 M -log (10.4/100) = .983 1 x 11.64/ 100 = .1170 M -log (4.8/100) = 1.32 1 x 15.14/ 100 = .1510 M -log (1.9/100) = 1.72 1 x 18.11/ 100 = .1810 M -log (1.0/100) = 2.00 1 x 20.00/ 100 =.2000M -log (.9/100) = 2.05 -log (.1/100) = 3.00 Graphs: Discussion: 1. The wavelength in experimented in this lab was at 770 nm. The equation for the best fit line is y = 11.249x – 0.0055. The Value for Epsilon is 11.25. The points compare very well to the line of best fit up until the .2 M on the x axis. After that

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