Chemistry > Lab Experiment > CHEM 121 General Chemistry Laboratory Freezing-Point Depression (All)
CHEM 121 General Chemistry Laboratory Freezing-Point Depression
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Using Freezing-Point Depression to Find Molecular Weight OBJECTIVES 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. Calculate the molecular weight of benzoic acid. MATERIALS Vernier computer interface Computer Logger Pro Temperature Probe Stir Station 400 mL beaker Tissue or paper towels Lauric acid, CH3(CH2)10COOH Lauric acid-benzoic acid mixture Hot water bath Two 18 × 150 mm test tubes Utility clamp INTRODUCTION When a solute is dissolved in a solvent, the freezing temperature is lowered in proportion to the number of moles of solute added. This property, known as freezing-point depression, is a colligative property; that is, it depends on the ratio of solute and solvent particles, not on the nature of the substance itself. The equation that shows this relationship is ΔT = -i Kf × m [Show More]
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