Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

The solubility and the physicochemical properties (density, viscosity) in the Na-Zn- Cl-H2O), (Na + Zn + H2PO2 + H2O), (Na + Cl + H2PO2 + H2O), and (Zn + Cl + H2PO2 + H2O) ternaries, and in Na+, Zn2+/Cl , (H2PO2) //H2O reciprocal quaternary systems at T = 273.15 K were investigated by using the isothermal method. The diagrams of ternary salts systems, (NaCl + ZnCl2 + H2O), (NaCl + NaH2PO2 + H2O), (NaH2PO2 + Zn(H2PO2)2 + H2O), (ZnCl2 + Zn(H2PO2)2 + H2O), are plotted in figures 1 4. However, whole ions of reciprocal quaternary salt systems are plotted in figure 5. Additionally, the density and viscosity values of ternary systems vs. their corresponding composition values in weight per cent are plotted in figures 6 10. At the (i) (ZnCl2 + Zn(H2PO2)2 + H2O), (ii) (NaCl + ZnCl2 + H2O), (iii) (NaCl + NaH2PO2 + H2O), (iv) (NaH2PO2 + Zn(H2PO2)2 + H2O) ternary systems the solid phase compositions have been determined as: (i) Zn(H2PO2)2 H2O, Zn(H2PO2)2, ZnCl2 2H2O, (ii) NaCl, 2NaCl ZnCl2 2H2O, and ZnCl2 2H2O, (iii) NaCl and NaH2PO2 H2O, (iv) Zn(H2PO2)2 H2O and NaH2PO2 H2O, respectively. On the other hand reciprocal quaternary system was observed as: ZnCl2 2H2O, 2NaCl ZnCl2 2H2O, Zn(H2PO2)2 H2O, NaH2PO2 H2O, NaCl. According to results, the least soluble salt was Zn(H2PO2)2. The crystallization field of this salt, being the largest in comparison with those of other salts, occupied 70% of the general crystallization field.