Chapter 11: Partial molar properties
[1]
partial molar volume
Ideal solution
In an ideal solution the molecules of the species are similar in size and nature and have the same intermolecular forces, therefore the total volume of the solution is equal to the sum of the quantities present in the mixture, there is no change in volume nor enthalpy.
In an ideal solution the molecules of the species are similar in size and nature and have the same intermolecular forces, therefore the total volume of the solution is equal to the sum of the quantities present in the mixture, there is no change in volume nor enthalpy.
Real solution
In a real solution the intermolecular forces change since the interactions between molecules are not identical. If a water quantity is added to a container and then, the same ethanol quantity is added, it would be expected for the volume to be the sum of these quantities. Nonetheless, by performing this experiment it is observed that the volume is less than expected. [2]
In a real solution the intermolecular forces change since the interactions between molecules are not identical. If a water quantity is added to a container and then, the same ethanol quantity is added, it would be expected for the volume to be the sum of these quantities. Nonetheless, by performing this experiment it is observed that the volume is less than expected. [2]
For real solutions the intermolecular forces are not equal, the mixture has a-a and a-b molecular interactions, which are not identical, causing the packaging of the molecules and the change in volume.
Application
Imagine you want to administrate a bar, certainly you have to calculate the drink cost per cup. Every cup has a mixture of ethanol and soda, so that if you want to calculate the total real cost of every cup, you have to calculate the partial molar property and apply the formulas.
Problem
To get a better idea about this topic, you can consult this paper to calify some boubts or to know a little bit more.
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References
[1] Soto, M. Volumen Parcial Molar. Lab de Mediciones Fisicoquímicas. ITESM. 2016.
[2] Almanza, Y. Equilibrium Thermodynamics. ITESM. 2016
[2] Almanza, Y. Equilibrium Thermodynamics. ITESM. 2016