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Posted

Hello,

 

I'm running some water-rock reactions using REACT, and I'm puzzled why the pH that GWB calculates (11.682 in one particular case) is not quite the same as -log( [H+] ), where [H+] in the same case is 2.508e-12, which yields a pH of 11.601.

 

Should I not be paying attention to the sig figs? I was just curious as to how GWB calculates pH, if not by -log( [H+] )

 

Thanks!

Posted

Hi Sanjoy,

 

Are you looking at the activity of the free H+ ion, or the concentration?

 

If the difference is not due to leaving out the activity coefficient, could you post your script so I can take a look?

 

Thanks,

 

Brian Farrell

Aqueous Solutions LLC

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