05.08 Colligative Properties

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05.08 Colligative Properties The purpose of this presentation is to demonstrate a real world application of colligative properties. Colligative properties are properties of solutions that are determined from the concentration of solute particles in a solution, and not by the identity (mass) of the particles in the solute. Colligative properties include freezing point depression, boiling point elevation, vapor pressure lowering, and osmotic pressure. When the temperature of a liquid is below its boiling point (evaporation), only the molecules around the surface of the liquid can escape into gas particles. Once a solute is added to the solvent, solute molecules occupy the molecular surface space of the liquid, swing the evaporation process. If the solute is dissolved in a solvent, the number of solvent molecules near the surface decreases, thus vapor pressure of the solvent decreases. Why does this property change when the solute is increased? One use for vapor pressure lowering is in distillation. Distillation is a liquid purification process using heating and cooling. Real World Application Vapor pressure is used in distillation to purify a compound by separating it from non-volatile material. The lowering of the vapor pressure causes molecular movement along the surface of a liquid and through processes of evaporation and vapor cooling; the compound is separated and distilled into its purer forms. Distillation there are many uses for colligative properties in the real world, and decreasing of vapor pressure is among the many that are implemented into modern techniques and technology today. "Colligative Properties of Solutions." Colligative Properties of Solutions. N.p., n.d. Web. 09 May 2015. "Distillation." Distillation. N.p., n.d. Web. 09 May 2015. "Solutions." Colligative Properties. N.p., n.d. Web. 09 May 2015. "Vapor Pressure

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