Extension to account for non-ideality

For higher concentrations, Aiassoc will have to be corrected for non-ideality by including activity coefficients calculated from the Debye-Htickel equation. 

But take note The Debye-Hiickel expression is not that which is used for unassociated electrolytes. There is one very important difference  

These activity coefficients must refer to activity coefficients calculated in terms of the actual ionic strength not the stoichiometric ionic strength, since they relate to the free ions only, and thus to a Their calculation will thus involve a series of successive approximations. 

If the electrolyte is unsymmetrical, the whole theoretical approach becomes much more complex. 

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