CHM211H5 Study Guide - Quiz Guide: Freezing-Point Depression, Colligative Properties, Naphthalene
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Determination of the molar mass is a valuable quantitative measure used to most accurately identify an unknown compound, as every compound has a unique molar mass. The molar mass of a white, powdery solute, whose identity was hypothesized to be naphthalene (molar mass. 128. 17 g/mol)1, was estimated via freezing point depression. The theory of freezing point depression discusses that adding a solute to a solvent such as cyclohexane will decrease the freezing point of the overall solution. This colligative property is related to the molar mass of a compound as the latter determines the molality of the solution, which effects the temperature at which the solution freezes. The freezing points of the solution and the molar masses for three trials of the experiment allow for the accurate identification of the compound using the average molar mass. The unknown compound was hypothesized to be naphthalene, as both have a white, flaky texture, and a pungent scent.
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