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L 18 - "Liquid Solutions I Liquid/Liquid Prof Gianluigi...

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“Liquid Solutions I- Liquid/Liquid” Prof. GianluigiVeglia
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Partial Molar Quantities: when 1+1 ≠2. We are getting ready to talk about mixtures, especially liquid solutions: benzene and toluene, methanol and water, sugar and water etc. We begin by introducing the subject of partial molar quantities , beginning with partial molar volume. The partial molar volume of a component j in a solution containing an arbitrary number of components is : ' , , n P T j j n V V =
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The unit of the partial molar volume is L or cm 3 per mole. Thus the partial molar volume is an intensive quantity that depend the temperature, pressure and composition. What is the physical meaning of the partial molar volume? If I had an infinite quantity of some solution and were to add j to the solution molecule by molecule (infinite volume ensures constant composition) and were to measure the volume change with added j that would be the partial molar volume.
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