Lecture_5b

533 the units of partial molar volumes are the same as

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Unformatted text preview: of a solution of, say, two miscible liquids is given by V = n1 V1 + n 2V2. (5.33) The units of partial molar volumes are the same as molar volumes. The relationship between the two, i.e., partial molar volume and the molar volume is a subtle but important one. Ÿ In the case of ideal solutions, the partial molar volume of each component will be identical to the molar volume of the pure substance in the absence of the other component. Ÿ However, in the case of non-ideal solutions, the presence of the second component has a measurable influence on the molar volume of the first component and vice versa. Therefore, in general, V 1 ! V  and V 2 ! V  . 2 1 The standard state for defining partial molar quantities is a 1 molal solution, i.e., a solution that contains 1 mol of the substance in 1.0 kg of solvent. Physical Interpretation of partial molar quantities: It may appear that there is something “not quite right” about the following two equations: V = n 1 V 1 + n 2 V 2 , where , and V 2 = æ ¹V ö . V 1 = æ ¹V ö ç ¹n ÷ ç ¹n ÷ è 1 ø P, T , n 2 è 2 ø P, T , n 1 Based on what we have seen so far, the first equation shoul...
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This document was uploaded on 02/28/2014 for the course CHEM 311 at LA Tech.

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