EXPERIMENT 23 OVERVIEW. GOAL DETERMINE MOLAR MASS OF S x AND THE VALUE OF x.

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Presentation transcript:

EXPERIMENT 23 OVERVIEW

GOAL DETERMINE MOLAR MASS OF S x AND THE VALUE OF x

METHOD FREEZING POINT DEPRESSION

Freezing point depression can be used to find molar mass of solute ∆T f ― experiments i ― electrolyte or nonelectrolyte K f ― table or reference book

Solute: S x Solvent: Naphthalene i = 1K f : given ΔT f = T f,solvent − T f,solution T f,solvent : Part A T f,solution : Part B Kilogram of naphthalene: balance Mass of S x : balance

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DATA ANALYSIS

Temperature (°C) Time (min) TfTf Cooling Curve liquid liquid + solid solid

GRAPHING USE SOFTWARE TO FIND T f USE FULL PAGE: CHOOSE SCALE PROPERLY GIVE GRAPH A TITLE LABEL AXIS, ADD LEGEND EXAMPLE

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