Lecture_05

39 540 546 these equations are useful to determine

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Unformatted text preview: to yield (see the text above Eq. 5.119) RT 2 M A f m or DT f = K f m B , DT f = (5.119, 5.120) D fus H m B where Kf is called the cryoscopic constant of the solvent. 12 Boiling Point Elevation: By considering the liquid-vapor equilibrium in which the vapor contains only the component A, we can derive an expression analogous to that obtained above: RT 2 M A b DT b = m or DT b = K b m B (5.126) D vap H m B where Kb is called the ebullioscopic constant of the solvent. The elevation of boiling point is a rather weak effect compared to the depression of freezing point. Therefore, the latter property is overwhelmingly used for the practical applications of colligative properties. Practical Applications: Ÿ Problems 5.39, 5.40, 5.46 Ÿ These equations are useful to determine the freezing points or boiling points of various solutions...
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This document was uploaded on 02/28/2014 for the course CHEM 311 at LA Tech.

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