Molar Mass Determination By Freezing Point Depression

Molar Mass Determination By Freezing Point Depression -...

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Molar Mass Determination by Freezing Point Depression Purpose: The purpose of experiment 12 is to cause the depression of the freezing point by the dissolution of an unknown solute in a solvent and then to determine the molar mass of the solute. Procedure: 1. Heat 400mL of tap water in a beaker, maintaining the temperature between 25 and 40 degrees Celsius. 2. Assemble the apparatus, using a mercury thermometer. 3. Retrieve the unknown sample form the instructor. 4. Label a clean and dry test tube; label it with an “A.” Weigh the tube and record it on the data page. 5. Measure 0.2 to 0.3 grams of the unknown sample. 6. Transfer the sample into the test tube, ensuring that none remains on the sides. 7. Weigh and record the test tube, beaker, and unknown. 8. Label a clean and dry test tube with a “B.” Pour 1 to 1.5 inches of glacial acetic acid into the test tube. 9. Clamp test tube B to the ring stand, lower the test tube into the water in the 600mL beaker. 10.
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Molar Mass Determination By Freezing Point Depression -...

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