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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