3AL Lecture 3 - Melting Points and Mixed Melting Points...

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Unformatted text preview: Melting Points and Mixed Melting Points Goals: 1. Learn how to measure melting points 2. Learn how to use melting points to establish the purity of a compound A Solid (S) B C D E Liquid (L) S L Gas (G) L G Energy Added Temperature m.p., f.p. b.p. Changes in Temperature of a Compound at Constant Pressure B = melting point/freezing point. P solid = P liquid (P = Vapor Pressure) Temperature Constant from B to C. D = boiling point/condensation point. P liquid = P applied Temperature Constant from D to E. A Pressure Versus Temperature Phase Diagram Curve CT = Vapor Pressure of a Solid at a Given T C T 1 P 1 T T P T T 3 P 3 Gas Solid Liquid Temperature Pressure T 2 P 2 T D E e.g T 1 = Sublimation Point at P 1 (Sublimation/Deposition Curve) Curve TD = Vapor Pressure of a Liquid at a Given T (Boiling Point/Condensation Curve) Line ET = Solid-Liquid Equilibrium P solid = P liquid e.g. T 2 = Boiling Point at P 2 e.g. T 3 = Melting Point at P 3 Point D = Critical Point (Supercritical Fluid is Formed) Point T = Triple Point (Solid, Liquid, and Gas are all in equilibrium) A Pressure Versus Temperature Phase Diagram Characteristic...
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This note was uploaded on 08/19/2009 for the course CHEM 3A taught by Professor Fretchet during the Spring '08 term at University of California, Berkeley.

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3AL Lecture 3 - Melting Points and Mixed Melting Points...

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