Ionic Strength Calculation: How to Account for All Ions in a Solution?

[ionic]

Hi,

I have a solution containing acetic acid and NaCl. The solution is adjusted to a particular pH value by adding NaOH. For the calculation of the undissociated acetic acid concentration, I use the correction suggested by Sortwell 2001 (J. Food Prot. 63(2): 222-230 (2000)), which says that I have to account for the ionic strength in order to calculate pKa properly.

But my question is: how do I calculate this ionic strength? Do I only take NaCl into account? Or do I also account for the presence of NaOH?

Thanks!

 

[Borek]

All ions present in the solution, but I have already answered this question somewhere else