Sanjoy Posted January 24, 2013 Share Posted January 24, 2013 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! Quote Link to comment Share on other sites More sharing options...
Brian Farrell Posted January 24, 2013 Share Posted January 24, 2013 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 Quote Link to comment Share on other sites More sharing options...
Sanjoy Posted January 24, 2013 Author Share Posted January 24, 2013 Aha! Thanks Brian, I was indeed looking at the concentration column by mistake. - cheers Quote Link to comment Share on other sites More sharing options...
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