The structure of concentrated aqueous solutions of sodium chloride under isobaric heating

摘要

The method of integral equations was used to study the special features of the formation of the structure of aqueous solutions NaCl: 10H(2)O and NaCl: 18H(2)O at 100MPa and 298-523 K. The results showed that tetrahedral ordering of solvent molecules was destroyed in these systems as the temperature increased. Although H-bonding in solutions persisted, the number of H-bonds considerably decreased at 523 K and 100 MPa. Isobaric heating caused substantial weakening of the coordinating ability of ions; with sodium, this temperature effect was stronger. Heating substantially increased the number of contact ion pairs in solutions and decreased the number of hydration -separated pairs.