MATEC Web of Conferences
Volume 5, 2013REMCES XII – XIIe Rencontre Marocaine sur la Chimie de l'État Solide
|Number of page(s)||2|
|Published online||09 September 2013|
Solubility of Malladrite Na2SiF6 and K2SiF6 in aqueous solutions
Laboratoire de Chimie Physique -Associé au CNRST-URAC17, Faculté des Sciences Ben M'sik, Université Hassan II Mohammedia-Casablanca, BP. 7955, Casablanca, Maroc
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The water activities of binary solutions Na2SiF6-H2O and K2SiF6-H2O are measured from dilution to saturation using the hygrometric method at temperature 353 K. From these experimental data, the activity coefficients of solute were calculated using parameters of ionic interaction model. These coefficients are used to predict the solubility products of the K°sp, the free energy ΔG°diss of dissolution and also the characterization of the precipitated phases to saturation of the system containing Na2SiF6 or K2SiF6. The analyzed of solid phase obtained from saturated solution is made by Xray- diffraction.
© Owned by the authors, published by EDP Sciences, 2013
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