1. Concentration and supersaturation
1.1 Concentration units and activity in solution
To express solute content, we use the classic definitions of concentrationC, mass fraction (sometimes expressed in g/100 g solution) and mole fraction.
For electrolyte solutions, it is not always sufficient to use concentrations, as thermodynamics requires the use of activitiesai. These are in fact concentrations (expressed in moles per liter) multiplied by a certain coefficient called the activity factor (fi ), so that for any species i :
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Concentration and supersaturation
Nucleation
References
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