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The equilibrium phase diagrams of NaCl−ZnCl 2 − H 2 O system at 260.35 and 250.15 K were studied by method of isothermal solution saturation, wet residues, and thermogravimetric analysis. Water content in precipitate at these temperatures for hydrate 2NaCl•ZnCl 2 •nH 2 O was determined, n = 3. Densities of ternary NaCl−ZnCl 2 −H 2 O solutions were measured at 288.15−321.35 K and compared with values predicting by the Laliberte model. It was shown that the model provides mainly underestimated density values.

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The equilibrium phase diagram of the Zn(NO 3 ) 2 −Ca(NO 3 ) 2 −H 2 O system at 251.85, 262.35, and 288.15 K was studied by the isothermal solution saturation method and wet residue analysis. Densities of ternary Zn(NO 3 ) 2 − Ca(NO 3 ) 2 −H 2 O solutions were measured at 298.15−321.35 K. For some solutions, pH measurements were provided at 298.15 K.