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Dr. Parkhurs,

Thank you very much for your prompt response. For exchange species activity is 
equivalent fractioons which is explained in page 12 of manual.

{activity} = Gama*be*ne/Te

However, I could not understand it. I think it is not just matter of  mol/L 
and mol/kg.

The reason is I tried to simulate and could get the matching output with 
significantly different Log K values.

With Regards,

Tirtha Raj Gautam
Department of Civil Engineering 
Auburn University, Auburn, AL 36849-5337  
Phone: (+1)  334-844-6289 (w), (+1) 334-826-9095(r) 
Fax: (+1) 334-844-6290 
Email: gautatr@xxxxxxxxxxxxxx

Quoting David L Parkhurst <dlpark@xxxxxxxx>:

> > Could you please let me know how may I convert K value under molar system
> of
> concentration of every species including CEC and CaX2.
> For relatively dilute waters (less than seawater), the difference between
> mol/L and mol/kg water is less than 2-3%. I don't think you need to worry
> about a units correction for the log Ks.
> David
> David Parkhurst (dlpark@xxxxxxxx)
> U.S. Geological Survey
> Box 25046, MS 413
> Denver Federal Center
> Denver, CO 80225
> Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled

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