Lab3_freezing_point

Lab3_freezing_point - Freezing Point Depression CH202 Lab 3...

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Freezing Point Depression CH202 Lab 3 Goals: To measure the freezing point depression for a solution. To calculate colligative molality and freezing point depression. Safety: Stearic and lauric acid are non-hazardous. Prolonged contact with stearic and lauric acid may cause irritation. Wash the affected area with soap and water. Waste: Please discard waste in the container on the side shelf. If necessary, warm the solid to a liquid for easy pouring. Do NOT place these materials in the sink: they will clog the drain.
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Freezing Point Depression Freezing point depression is a colligative property, where the temperature change is dependent upon the AMOUNT of solute, and not the identity of the solute. T f = k f • i • m = k f • m c T f = T pure solvent ° T solution in ”C k f = freezing point constant of solvent 4.5 ”C/m i = van±t Hoff factor = number of particles produced when a solute dissoves = 1 for stearic acid m = molality = mol solute / kg solvent m c = colligative molality = i • m Where Other colligative properties include boiling point elevation, vapor pressure lowering and osmotic pressure.
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