freezing point depression

freezing point depression - Emily Bissel February 5, 2008...

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Emily Bissel February 5, 2008 MS#1116 Tuesday PM Freezing Point Depression Introduction: Colligative properties, or properties which depend upon the number of solute particles rather than the type of particles are found in many places in nature. They include boiling point, osmotic pressure, and freezing point. When a solute is added into a solvent, the freezing point of the solution will be lower than that of the original solvent. This is because as the temperature of the solution decreases, the kinetic energy, or speed at which the molecules are moving, also decreases. This causes for less collisions among the molecules to occur and for the molecules to stick together. However, when there is a solute in the solvent, the molecules of the solute interfere with the solvents ability to form a solid, and the temperature must be decreased more. As the concentration of the solution (the amount of solute in the solution) increases, the freezing point depression also decreases. This can be seen in Raoult’s law which applying to ideal solutions says that the freezing point depression is directly proportional to the molal, or mols per kilogram concentration. Using the equation
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This note was uploaded on 04/16/2008 for the course CHEM 006L taught by Professor Miller during the Spring '08 term at Westmont.

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freezing point depression - Emily Bissel February 5, 2008...

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