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React pH calculation


Sanjoy
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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!

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