title: Modeling Closed Equilibrium Systems of H2O-Dissolved CO2-Solid CaCO3.
abstract: In many places in the world, including North Estonia, the bedrock is limestone, which consists mainly of CaCO3. Equilibrium processes in water involving dissolved CO2and solid CaCO3play a vital role in many biological and technological systems. The solubility of CaCO3in water is relatively low. Depending on the concentration of dissolved CO2, the solubility of CaCO3changes, which determines several important ground- and wastewater parameters, for example, Ca2+concentration and pH. The distribution of ions and molecules in the closed system solid H2O-dissolved CO2-solid CaCO3is described in terms of a structural scheme. Mathematical models were developed for the calculation of pH and concentrations of ions and molecules (Ca2+, CO32-, HCO3-, H2CO3, CO2, H+, and OH-) in the closed equilibrium system at different initial concentrations of CO2in the water phase using an iteration method. The developed models were then experimentally validated.
authors.affiliation: Institute of Chemistry, University of Tartu , 14a Ravila St., Tartu 50411, Estonia.
authors.forename: Toomas
authors.identifier: http://orcid.org/0000-0001-5877-8243
authors.initials: T
authors.lastname: Tenno
authors.affiliation: Institute of Chemistry, University of Tartu , 14a Ravila St., Tartu 50411, Estonia.
authors.forename: Kalev
authors.identifier: http://orcid.org/0000-0003-4356-3236
authors.initials: K
authors.lastname: Uiga
authors.affiliation: Institute of Chemistry, University of Tartu , 14a Ravila St., Tartu 50411, Estonia.
authors.forename: Alexsey
authors.initials: A
authors.lastname: Mashirin
authors.affiliation: Institute of Chemistry, University of Tartu , 14a Ravila St., Tartu 50411, Estonia.
authors.forename: Ivar
authors.initials: I
authors.lastname: Zekker
authors.affiliation: Institute of Chemistry, University of Tartu , 14a Ravila St., Tartu 50411, Estonia.
authors.forename: Ergo
authors.initials: E
authors.lastname: Rikmann