Conductivity Studies of n-Tetrabutylammonium Tetraphenylborate in 3-Pentanone in the Temperature Range from 283.15 to 329.15 K.

Abstract??The molar conductivities (?) of solutions ofn-tetrabutylammonium tetraphenylborate (NBu₄BPh₄) in 3-pentanone have been measured in the temperature range from 283.15 to 329.15 K. The conductance data have been analyzed using the Lee-Wheaton conductivity equation with the distance parameter (a) set at Bjerrum?s pairing distance, and the limiting molar conductivities (?_o) and the association equilibrium constants (K_A) have been derived. The limiting ion conductivities (?_?^o) have been evaluated according to the method of Krumgalz. The ?₊^ovalues have been compared with ?₊^ovalues calculated from the empirical equation of Gill. The thermodynamic functions, Gibbs energy (?G_A^o), enthalpy (?H_A^o) and entropy (?S_A^o) for the process of ion-pair formation as well as the activation energy of the ionic movement (?H^?) have been evaluated. The obtained results are discussed in terms of ion-ion and ion-solvent interactions. [ABSTRACT FROM AUTHOR]