Table 1 Thermodynamic equilibrium constants from the Geochemists Workbench, thermo.dat database used to account for aqueous speciation [18].
From: Geochemical detection of carbon dioxide in dilute aquifers
| Mass balance reactions | log K(17°C) |
| CaCO3 (Calcite) + H+ = Ca2+ + HCO3- | 1.83 |
| SiO2 (Quartz) = SiO2 (aq) | -4.15 |
| CO2(g) + H2O = H+ +HCO3- | -7.77 |
| CO2(aq) + H2O = H+ + HCO3- | -6.42 |
| CO32- + H+ = HCO3- | 10.42 |
| NaHCO3 + = Na++HCO3- | -0.20 |
| H2O = H+ + OH- | -14.27 |