Lab Report Experiment 13

Lab Report Experiment 13 - William Seo Experiment 13:...

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William Seo Experiment 13: Freezing Point Depression to Determine Molar Mass Ameneh Cheshmehkani CHEM 1211k – C02 December 5, 2011 I did not share this lab report with anyone after lab was finished.
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Data/Results PART A & B Data Table with time and temperature data for Lauric acid and Lauric acid + solute Lauric Acid Table Lauric Acid + Solute Table Time (sec) Temperature (°C) 0 69.8 15 68.9 30 67.4 45 65.3 60 58.3 75 57.2 90 51.7 105 47.9 120 45.7 135 44.2 150 43.3 165 43.0 180 43.0 195 42.9 210 42.8 225 42.8 240 42.7 255 42.5 270 42.2 285 42.4 300 42.3 315 41.9 330 41.9 345 41.3 360 41.3 375 41.4 390 41.3 405 40.4 420 38.9 435 36.7 450 34.3 465 31.2 480 26.8 495 23.8 510 21.0 525 19.0 540 17.9 555 16.6 570 15.0 585 13.0 600 12.2 Time (sec) Temperature (°C) 0 84.9 15 81.4 30 77.2
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45 64.9 60 58.7 75 50.3 90 45.2 105 42.4 120 40.4 135 39.2 150 38.7 165 38.7 180 38.5 195 38.3 210 38.2 225 38.1 240 38.0 255 37.5 270 37.6 285 36.3 300 35.1 315 34.2 330 33.4 345 36.7 360 35.6 375 34.4 390 33.4 405 32.8 420 32.2 435 31.9 450 34.4 465 34.0 480 33.1 495 32.2 510 31.4 525 30.7 540 29.9 555 28.8 570 27.1 585 25.2 600 23.1 Plot of Temperature vs. Time Freezing point of lauric acid + solute = 42°C Freezing point lauric acid = 46°C Sample Calculations: -molality (m) of mixture
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-moles of solute (benzoic acid) -Molar mass of unknown PART C . Calculation of T for 2.000 g of MgCl 2 *6H 2 O in 10.0 mL of water, assuming no dissociation Calculation of T for 2.000 g of MgCl 2 *6H 2 O in 10.0 mL of water, assuming it completely dissociates Data Table with time and temperature data for 2.016 g of MgCl 2 *6H 2 O in 10.xxx g water Time (sec) Temperature (°C) 0 83.9 15 79.5 30 75.9 45 52.4 60 44.4 75 32.2 90 21.4 105 18.2 120 14.8 135 10.7 150 9.4 165 4.4 180 2.4 195 1.2 210 0.2 225 -1.6 240 -3.5 255 -5.1 270 -6.1 285 -6.8 300 -7.5 315 -7.1 330 -6.1 345 -6.4 360 -6.9 375 -6.8 390 -6.9 405 -7.0 420 -7.3 435 -7.2 450 -7.7
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465 -7.4 480 -7.7 495 -7.7 510 -7.7 525 -7.9 540 -8.3 555 -8.3 570 -6.8 585 -8.5 600 -8.7 Calculation of experimental i, van’t Hoff Factor
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General Discussion: Discuss data and results and their validity In this experiment, the freezing points of lauric acid, a mixture of lauric acid and an unknown solution, and magnesium chloride hexahydrate was determined. The results in part A and B are valid because of the small percent error of the molality compared to theoretical values. For instance, the molality of the solution obtained in part B was found to be 1.026m. In order to compare to theoretical values, first, the experimental
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This note was uploaded on 02/26/2012 for the course CHBE 2100 taught by Professor Staff during the Spring '08 term at Georgia Tech.

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Lab Report Experiment 13 - William Seo Experiment 13:...

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