Structural parameters of concentrated aqueous solutions of LiCl under extreme conditions, as calculated by the method of integral equations. Effect of temperature

Peculiarities of structure formation of aqueous LiCl solutions at different salt : water molar ratios (LiCl : n H2O, n = 3.15, 8.05, 14.90) under cond itions of isobaric heating (p = 100 bar, T = 298, 323-523 K, DeltaT = 50 K) were studied by the method of integral equations. Heating of LiCl : 14.90H (2)O solution was found to lead to disappearance of tetrahedral ordering of solvent molecules, appreciable weakening of the coordination abilities of both ions, and to an increase of the number of contact ion pairs and a decr ease of the number of solvent-separated ion pairs. For the LiCl : 8.05H(2)O system, the tetrahedral structure of the solvent disappears at a lower tem perature and heating has a less pronounced effect on the coordination and a ssociative abilities of the ions. In the LiCl : 3.15H(2)O solution, tetrahe dral ordering of the solvent molecules disappears at 298 K and the number o f contact ion pairs decreases as temperature increases. Other structural ch anges in this system upon heating are similar to those found for the LiCl : 14.90H(2)O and LiCl : 8.05H(2)O solutions.