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Using Freezing-Point Depressionto Find Molecular WeightOBJECTIVESIn this experiment, you will determine the freezing temperature of the pure solvent, lauric acid, determine the freezing temperature of a mixture of lauric acid and benzoic acid, calculate the freezing point depression of the mixture, and calculate the molecular weight of benzoic acid.mFigure 1PRE-LABORATORY QUESTIONS1.State the molecular basis for freezing point depression.2.Is it important to convert the temperatures measured to K? Would it make a difference in your calculations?MATERIALS
Vernier computer interfacecomputerTemperature Probe ring stand400 mL beakerlauric acid, CH3(CH2)10COOHlauric acid-benzoic acid mixturehot water bathtwo 18 150 mm test tubesutility clamp paper towel or tissuePROCEDURE1.Obtain and wear goggles.