Experiment 4

Experiment 4 - Experiment 4 Colligative Properties...

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Unformatted text preview: Experiment 4 Colligative Properties: Freezing-Point Depression and Molar Mass Purpose • To use the colligative property of freezing-point depression to determine the molar mass of an unknown organic substance Theory Section 12.6 Chang Chemistry Textbook • When a non-volatile solute is added to a solvent, the solvent’s properties change – Vapor pressure is lowered – Boiling point is elevated – Freezing point is lowered Called the colligative properties Colligative Properties Colligative properties are properties that depend only on the number of solute particles in solution and not on the nature of the solute particles. 12.6 Vapor Pressure Lowering The lowering of the solvent’s vapor pressure is due to the solute particles hindering the solvent particles in getting into the vapor phase, i.e. the solute particles “get in the way” 12.6 Boiling Point Elevation The represents the solvent in the presence of solute Freezing-Point Depression 12.6 Freezing-Point Depression ∆ T f = Tº f – T f T f < T f ∆ T f > 0 Tº f is the freezing point of the pure solvent T f is the freezing point of the solution ∆ T f = K f m m is the molality of the solute in the solution K f is the molal freezing-point depression constant ( C/ m ) and is specific to the solvent Colligative Properties Lab. • The amount by which the freezing point is lowered or the boiling point raised is proportional to the mole fraction of solute....
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Experiment 4 - Experiment 4 Colligative Properties...

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