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Meets AP® Chemistry topic 4. In this powerful illustration of colligative properties, students determine the molar mass of a substance by freezing-point depression. First, they identify a pure solvent's freezing point, dissolve their sample in the solvent, and determine the freezing point of this solution. The freezing-point depression is then used to calculate the sample's molar mass. All kit materials are reusable and the kit includes a test tube rack for easy storage of freezing-point samples.
An optional procedure for collecting data using temperature probes is included. Materials are sufficient for 30 students working in pairs.
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