Heat capacities, heats of dilution and apparent molal enthalpies of quaternary systems of the brine containing lithium at 298.15K

Abstract

Heat capacities and heats of dilution of LiCl-NaCl- KCl-H₂O, LiCl-NaCl-MgCl₂-H₂O and LiCI-KCl³ MgCl₂-H₂O quaternary systems have been measured in the range of ionic strength from 19 to 0.1 at 298.15K. The data of the heat of dilution have been extrapolated to infinite dilution by use of the Debye-Hückel limiting law to obtain relative apparent molal enthalpies over the ionic strength from 19 to 0.0001. The results show that the heats of dilution are negative which means that dilution process of the various systems are exothermic. When ionic strengths are high, the values of heat capacities are smaller and the values of apparent molal enthalpies are greater. All these systems are similar to single electrolyte solution of alkaline earth metal in heat effect.