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Behij S.,Center National Of Recherche En Science Des Materiaux Technoe Of Borj Cedria | Hamzaoui A.H.,Center National Of Recherche En Science Des Materiaux Technoe Of Borj Cedria | Rokbani R.,Center National Of Recherche En Science Des Materiaux Technoe Of Borj Cedria | M'Nif A.,Center National Of Recherche En Science Des Materiaux Technoe Of Borj Cedria
Russian Journal of Inorganic Chemistry | Year: 2011

Solubility of sodium, potassium and calcium sulfates and chlorides in 28% ammonia solution was determined through monitoring conductivity measurements and kinetics of solids dissolution as a function of temperature and stirring time. The major findings of the present study show that Na 2SO 4 and K 2SO 4 solutions conductivity follow straight linear segments with different slopes. However, in case of NaCl, KC1, CaCl 2 and CaSO 4 · 2H 2O, conductivity curves were continuous, monotonous and reach constants maximum values. The hypothesis of complex formation or dissolution via intermediaries such as NaNH 4SO 4 and KNH 4SO 4 salts seams to be true, through X-ray diffraction study of resulting deposits. Furthermore, the dissolution rates at 25°C of potassium and calcium chlorides in ammonia solution are higher than that reported in the literature for water. In fact, ammonia significantly reduces the solubility of K 2SO 4; conversely, a slight increase in this parameter was observed for CaSO 4. © Pleiades Publishing, Ltd., 2011.

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