molmass_fp - Molecular Mass by Freezing Point Depression...

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Molecular Mass by Freezing Point Depression Kyle Miller November 28, 2006 1 Purpose The purpose of this experiment is to determine the molecular mass of organic compounds which are dissolved in a solvent by noting the depression in the freezing point of the solution as compared to the freezing point of pure solvent since freezing point depends only on the number of particles that are dissolved. 2 Procedure A measured mass of about 8 grams of Butylated hydroxytoluene (BHT) is placed into a test tube with a thermometer and stirring wire which is then put into a hot water bath. Once the water bath reaches 90 C, the test tube is removed and the temperature of the BHT is recorded every 20 seconds while being stirred continuously. The values are recorded until five constant measurements are taken. The same procedure is then followed two more times except the BHT is mixed with either 1 gram of para -dichlorobenzene or 1 gram of the unknown compound. 1
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3 Data The following data were collected: 3.1 Pure BHT Mass of BHT melted was 7.90g Time (s) T ( C) 20 85.9 40 83.2 60 81.8 80 78.6 100 75.8 120 73.9 140 72.0 160 70.9 180 69.0 200 68.8 220 68.8 240 68.8 260 68.8 280 68.7 300 68.7 2
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3.2 BHT and para -dichlorobenzene Mass of BHT melted was 7.90g Mass of para -dichlorobenzene melted was 1.05g Time (s) T ( C) 20 87.0 40 85.1 60 82.9 80 81.3 100 78.6 120 76.1 140 73.9 160 71.9 180 70.2 200 67.9 220 66.2 240 64.0 260 62.0 280 61.0 300 59.6 320 58.3 340 58.3 360 58.5 380 58.5 400 58.0 420 57.8 440 57.5 460 57.3 3.3 BHT and the unknown
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This note was uploaded on 12/09/2011 for the course CHEM 1 taught by Professor Staff during the Summer '11 term at Simon Fraser.

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molmass_fp - Molecular Mass by Freezing Point Depression...

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