Determination of Molar Mass of Compound by Freezing Point

Determination of Molar Mass of Compound by Freezing Point -...

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Determination of Molar Mass By Freezing Point Depression January 29, 2008 Section 2104 Course Number 4003 Simon Duri Amanda Quella
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I. Purpose: The purpose of this lab is to determine the molar mass of a substance through the use of the colligative property of freezing point of that substance. II. Procedure 1. 10-25 grams of stearic acid was measured and placed into a test tube. 2. The test tube was then placed in a hot water bath and the solvent was melted. 3. The thermometer was hung from a ring stand so that the thermometer is just above the bottom of the test tube. 4. The solvent was then agitated and the temperature was recorded. 5. The solvent was agitated continuously and the temperature was recorded in increments of 30 seconds. 6. The solvent was then re-melted after solidifying and steps 1-5 were repeated. 7. An unknown was received from the stock room and weighed. 8. The solvent was re-melted and the unknown was added to the test tube and melted again. 9. The test tube with the solvent and the unknown were then removed from the hot water bath and the temperature was recorded in 30 second increments. 10. While the solvent and the unknown were solidifying, the solution was being agitated. 11. The solvent and the unknown were re-melted and steps 8-10 were repeated. 12. The unknown and the solvent were disposed of by melting the solution down and pouring it into a beaker under the hood. III. Data
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Trial One (Stearic Acid) Time (seconds) Temperature (C ) 0 82.0 30 75.0 60 72.5 90 71.0 120 70.0 150 69.7 180 69.0 210 69.0 240 68.9 270 68.0 300 68.0 330 68.0 360 68.0 390 68.0 420 67.5 450 67.0 480 66.9 510 66.8 540 66.0 570 65.0 600 64.0
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Trial Two (Stearic Acid) Time (seconds) Temperature (C ) 0 77.0 30 76.8 60 74.0 90 72.0 120 69.8 150 68.0 180 66.0 210 65.0 240 65.0 270 65.0 300 65.0 330 65.0
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