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CHEM 300 Lab 6 - Determination of the Iodine Number of...

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Determination of the Iodine Number of Known and Unknown Oils Lab 6 Alina Lane TA: Joni Longenecker November 2007 Results: Thiosulfate Concentration: Day Trial Conc. (mol/L) Mean Conc. (M) Std. Dev. (M) 1 1 0.04729108 0.04769 3.952E-04 2 0.048081153 3 0.047706794 2 1 0.047439737 0.04755 1.562E-04 2 0.04766061 3 1 0.048419454 0.04842 2.526E-04 2 0.048670944 3 0.048165777 ICl Concentration: Day Trial Conc. (mol/L) Mean Conc. (M) Std. Dev. (M) 1 1 0.0961 0.09613 5.7735E-05 2 0.0962 3 0.0961 2 1 0.0971 0.09714 4.233E-03 3 1 0.0971 0.09714 4.233E-03 Iodine Numbers Calculated: Corn Oil : (Tops Brand, Lot #: 7078444364, Use By: 8/15/07) Trial Iodine Number Mean Iodine # Std. Dev. 1 122.4 g I 2 / 100g oil 125.0 g I 2 / 100g oil 3.808 g I 2 / 100g oil 2 129.4 g I 2 / 100g oil 3 123.3 g I 2 / 100g oil Unknown # 20 : Trial Iodine Number Mean Iodine # Std. Dev. 1 154.1 g I 2 / 100g oil 154.9 g I 2 / 100g oil 1.652 g I 2 / 100g oil 2 156.8 g I 2 / 100g oil 3 153.8 g I 2 / 100g oil 1
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Alina Lane November 29, 2007 Lab 6 Determination of the Iodine Number of Corn Oil and an Unknown Oil Purpose: To determine the iodine number of a known oil (corn oil) and an unknown oil (#20) by experimentally determining the number of grams of I 2 whose unsaturated bonds would react with oil to become saturated with 100 g of oil. Data Day 1 Calculations : (see attached page of calculation demonstration, pg. ____ and also the data presented in the Excel Worksheet on pg. ____) On Day 1, we experimentally determined the concentration of the thiosulfate solution we prepared as well as the concentration of 0.01M ICl solution that was prepared for us by the lab. To determine the thiosulfate solution, we measured the time and current that ran through a solution containing 2.000mL of the thiosulfate solution. From this time and current, we could calculate the number of moles of electrons that the current transferred to the solution. This number of moles of electrons is proportional to the moles of S 2 O 3 2- that the solution contains. Since we calculated the moles of thiosulfate in the solution, we just need to divide it by the volume of thiosulfate solutions used (2.000mL) to determine the concentration. The “estimated” value I listed is the concentration I calculated from the grams of thiosulfate measured and diluted to 500 mL.
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