The concentration dependences of the differential enthalpies of solution were measured along several crystallization paths in the above-mentioned system, and the enthalpies of crystallization of mixed crystals occurring as a stable solid phase in the system were calculated on this basis. The obtained results confirmed the existence of a region of breaking continuity in the equilibrium solid phases.
The direct measurements of differential enthalpies of solution ΔsolH2, of LiCl·H2O, NaCl, KCl, MgCl2·6H2O, CaCl2·6H2O and BaCl2·2H2O, as the function of molality,m, in the region of concentrated solutions were performed. On this basis the enthalpies of crystallization, ΔcrystHm, were calculated and compared to the appropriate literature data.
The concentration dependencies of the differential enthalpies of solution were measured along several crystallization paths
in the KCl−KBr−H2O system. On this basis enthalpies of crystallization of mixed crystals occurring as a stable solid phase in the system were
The concentration dependencies of the differential enthalpies of solution along several crystallization paths in the above
mentioned system were measured. On this basis enthalpies of crystallization of equilibrium solid phases occurring there were
For the equilibrium solid phases occurring in the systems: KCl−KBr−H2O, K2SO4−(NH4)2SO4−H2O and KNO3−NH4NO3−H2O, the concentration dependencies of differential solution enthalpies, ΔsolH2 for several crystallization paths, were measured. The limiting differential solution enthalpies, ΔsolH20
, were determined by extrapolation of the above dependencies to the ionic strength,Im0
, corresponding to the appropriate binary solutions. For KCl−KBr−H2O system only, the clear dependence between ΔsolH20
values was found and discussed.
The enthalpies of crystallization of NaCl, KCl, LiCl·H2O, MgCl2·6H2O, CaCl2·6H2O and BaCl2·2H2O from aqueous solution were determined by means of different calculation methods on the basis of the earlier-measured differential and integral enthalpies of solution of the above salts. The obtained crystallization enthalpies are discussed and compared with the appropriate literature data.