6A_Lecture_2

6A_Lecture_2 - Lecture 3 Refractive Index Boiling Point and...

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Unformatted text preview: Lecture 3 Refractive Index Boiling Point and Vapor Pressure Experiment 2 Infrared Spectroscopy *Not Part of Experiment* n = sin i/sin r or c/ ʋ ◦ C= speed of light in vacuum (3.00 E8 m/s) ◦ ʋ = speed of light through the material n D 20 = Should be reading for Week 2: ◦ Chapter 4- Glassware ◦ Chapter 13-13.4, 13.8 – Distillation Should be reading for Week 3: ◦ Chapter 11- Extraction ◦ Chapter 12- Drying Organic Liquids ◦ Chapter 15- Recrystallization Properties of solutions that depend upon the number of particles, not the mass of the particles. ◦ Freezing (Melting) point depression Freezing Point total = Freezing Point solvent – Δ T f ◦ Boiling point elevation Boiling Point total = Boiling Point solvent + Δ T b ◦ Osmotic Pressure ◦ Vapor Pressure Liquid ⇌ Vapor Vapor Pressure: pressure a liquid exerts on environment Boiling Point: when vapor pressure equals atmospheric pressure What chemical features influence boiling point? ◦ Intermolecular Forces Hydrogen Bonding VdW Forces ◦ Size of molecule (more surface area = more intermolecular forces Mohrig, page 128 Rault’s Law ( P = P°X) ◦ P = partial vapor pressure ◦ P° = vapor pressure of pure substance ◦ X = mol fraction of pure substance in solution X A = mol A / total number of moles solution...
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This note was uploaded on 09/09/2011 for the course CHEM 6a taught by Professor Pettus during the Spring '07 term at UCSB.

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6A_Lecture_2 - Lecture 3 Refractive Index Boiling Point and...

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