A Computer Technique for Prediction of CaCO3 Precipitation in HCO3‐ Salt Solutions

Five salt solution systems containing HCO 3 ‐ were concentrated by evaporation, in contact with laboratory atmosphere, to simulate 2‐to 10‐fold reduction in volume. The amounts of CaCO 3 precipitated, final pH, and final solute concentrations were comprehensively predicted from the initial solute concentrations, degree of concentration of initial solution volume, and final P CO 2 . A flow diagram of the computational scheme is presented for IBM 7040 Data Processing System. The basic equilibrium relationships in the CaCO 3 and HCO 3 ‐ ‐CO 3 2‐ cycles are applicable to any aqueous systems which precipitate CaCO 3 due to changes in solute concentration, partial pressure of CO 2 or ambient temperature.