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?
Calculate a carbonate system with Spec8
in The Geochemist's Workbench Community
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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