Molar Mass by Freezing Point Depression—College Level Classic General Chemistry Laboratory Kit

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College Level Classic General Chemistry Experiment Students determine the molar mass of an unknown substance by measuring the freezing point depression of a solution of an unknown substance and the compound BHT (2,6-Di-tert-butyl-4-methylphenol). The freezing point of BHT is determined first, followed by the freezing point of a solution of the known substance dissolved in BHT. The freezing depression constant, kfp, for BHT is calculated from these values and used, along with the freezing point depression of a solution of the unknown substance and BHT, to calculate the molar mass of the unknown. Students gain the recommended familiarity with the observation and recording of phase changes. An alternative microscale procedure is included as a supplement. Complete for 24 students working in pairs.