Abstract
The solubilities of sodium metasilicate nonahydrate (Na2SiO3·9H2O) in the NaCl–H2O, KCl–H2O, and NaCl–KCl–H2O systems were determined at the temperature range from (288.15 to 308.15) K using a dynamic method. The results show that the solubility of Na2SiO3·9H2O decreases first and then levels off with increasing concentration of NaCl from (0.17 to 4.50) mol·kg–1, whereas the solubility in the Na2SiO3·9H2O(s)-saturated KCl solution increases slightly with the addition of KCl in the concentration range from (0.20 to 3.10) mol·kg–1. The Na2SiO3·9H2O solubilities in all cases investigated were found to increase with the temperature increment. A new chemical model for the solubility has been established by the regression of the experimental solubilities data in the NaCl–H2O system to obtain the parameters of the Bromley–Zemaitis model. These newly obtained model parameters were applied to well predict the Na2SiO3·9H2O solubility in two other systems, namely, the KCl–H2O and the NaCl–KCl–H2O systems, without parametrization with an average relative deviation of 1.4 % and 4.1 %, respectively.
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