CONDUCTIVITY STUDY OF NACL AND NAI SOLUTIONS IN WATER-2-BUTOXYETHANOLMIXTURES AT 298.15K - THE EFFECT OF ION-PAIRING ON THE STANDARD DISSOLUTION ENTHALPIES OF NACL AND NAI

The electric conductivity of NaCl and NaI in water -2-butoxyethanol mi xtures was measured at 298.15K and analysed using Fuoss -Justice equat ion. For the both salts, the limiting molar conductance decreases and the equilibrium constant of ion-pair formation increases along with in crease of 2-butoxyethanol content. The standard dissolution enthalpies of NaCl and NaI in water - 2-butoxyethanol mixtures were recalculated taking into account the ion -association process. The electric permit tivity for mixtures of water with 2-butoxyethanol was measured over th e whole composition range within 288.15 - 308.15K. The Kirkwood correl ation factor for investigated mixtures was calculated.