Sanjoy Posted January 24, 2013 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
Brian Farrell Posted January 24, 2013 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
Sanjoy Posted January 24, 2013 Author Posted January 24, 2013 Aha! Thanks Brian, I was indeed looking at the concentration column by mistake. - cheers Quote
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