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Unformatted text preview: P ben = 94.6 torr P tol = 29.1 torr Comparison to Henry’s Law • Raoult’s Law – two components P total = P A + P B = X A,liq P A,pure + X B,liq P B,pure – vapor pressure above nearly a pure solvent • Henry’s Law – two components S = k H x P – solubility of vapor into a pure solvent 3 Fractional Distillation • Separation of liquid mixtures on basis of boiling point • Vapor is richer in more volatile component • Successive boiling and condensing steps Osmosis • Flow of solvent through a semi-permeable membrane into a solution – Driven by concentration differences – Solute blocks flow of solvent • Osmotic pressure – pressure to stop solvent flow Π = RT x molarity Consequences • Osmometry – determination of MW • Desalination – reverse osmosis • Cell nutrient regulation...
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- Spring '10