Tobias Posted December 8, 2020 Share Posted December 8, 2020 Dear GWB developers and users, I am unsure how to create the correct system in Spec8 to calculate my solution. I am creating a supersaturated solution by mixing two initial solutions. Initial solution A: Aqueous solution with 3 mmol/L CaCl2 Initial solution B: Aqueous solution with 3 mmol/L NaHCO3 Mixed solution: Ratio 1:1 of the initial solutions The solution is supersaturated for some minerals which start to nucleate after an induction time. I want to calculate the Supersaturation with GWB Spec8. To add 1.5 mmol/L Ca++ and 3 mmol/L Cl- is quite trivial. Also the H+ <-> CO2(g) change to state the environment is clear. Unclear is the NaHCO3 in my solution. The Na+ should be 1.5 mmol/L (no problem) but what about the HCO3-? Due to the carbonate system of CO2(aq), H2CO3, HCO3- and CO3-- I have clearly less than 3 mmol/L. Do I have to change HCO3- to NaHCO3? Is that change in conflict with the Na+ entry? Summary question: How do I determine the Na+ and HCO3- content accurately in a carbonate system if I add NaHCO3? Best regards, Tobias Quote Link to comment Share on other sites More sharing options...
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