Lab Report 3 (Determination of a Molar Mass by Freezing Point Depression) - Experiment 3 Experiment Title Determination of a Molar Mass by Freezing

Lab Report 3 (Determination of a Molar Mass by Freezing Point Depression)

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Experiment #3Experiment Title: Determination of a Molar Mass by Freezing PointDepressionStudent Name: Student Number: Lab Partner:Tanzeela TanveerSection Number: 0116Date the experiment was performed: Feb/28th/2013Date the lab report was submitted: March/7th/2013Submitted to Tae Hun KimPre-lab/20Purpose/5Experimental Method/5Collection of Data/5Results and Calculations/20Accuracy/5Summary/3References/2Experimental Technique/10Report Presentation/10Writing Initiative/15
Introduction:One of the first experiments tempted on unknown compounds in the determination of the molar mass. There are many ways to do this but this experiment will focus on a colligative property, namely freezing point depression. When a non-volatile solute is dissolved in a solvent, the equilibrium vapour pressure of the resultant solution is always less than the equilibrium vapour pressure of the pure solvent. The lowering of the vapour pressure results in the freezing point temperature of solution to be lower than that of pure solvent. The amount at which the freezing point is lowered depends upon the concentration of the solution, and the freezing point depression. Purpose: The purpose of this experiment is to determine the molar mass of an unknown, non-volatile solute which is dissolved in a solvent by noting the depression in the freezing point of

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