Lecture_30

# Lecture_30 - Today's Lecture Properties of Solutions 17.1...

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1 1 Properties of Solutions Today’s Lecture 17.1 Solution Composition 17.2 The Thermodynamics of Solution Formation 17.3 Factors Affecting Solubility 17.4 The Vapor Pressures of Solutions 1 ± when a mixture is homogeneous - it is called a solution ± we generally think of the state of the solution as being Solutions liquid but solutions can begases , liquids, or solids (e.g. air is a solution) ± generally, we’ll discuss the properties of liquid solutions ± a mixture has a variable composition - need to define some important terms: 2 ± solute: is the substance being dissolved ± solvent: is the dissolving medium ± dilute solution: relatively little solute ± concentrated solution: relatively large amount of solute

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2 2 Solutions (cont’d) ± a solution that contains as much dissolved solute as it can under existing conditions is called a saturated solution ± if there is less solute dissolved than the maximum amount, the solution is called an unsaturated solution ± note that in some solutions, the solute and solvent are miscible (dissolve) in all proportions (i.e. the solution never becomes saturated) 3 ± e.g. ethanol-water mixture ± it is also possible to form a supersaturated solution , which contains more dissolved solute than in a saturated solution - how is this possible? Other Ways of Describing Solutions ± Molarity (M): ± moles of solute per litre of solution ± Mass Percent: ± (grams of solute/grams of solution) x 100% ± Mole Fraction ( χ ): A n 4 ± ± Molality (m): ± moles of solute/kg of solvent B A A n n + = χ
3 3 Solution Thermodynamics ±

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## This note was uploaded on 06/27/2009 for the course CHEM CHEM 121 taught by Professor Peggy during the Spring '09 term at Simon Fraser.

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Lecture_30 - Today's Lecture Properties of Solutions 17.1...

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