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The molar conductivities ( Λ ) of solutions of  n -tetrabutylammonium tetraphenylborate (NBu 4 BPh 4 ) in acetone (ACE) and acetonitrile (ACN) have been measured at eight different temperatures in the range from 283.15 to 303.15K. The  Λ  values have been analysed using the Lee–Wheaton conductivity equation in the Pethybridge-Taba modification and the limiting molar conductivities ( Λ  o ) and the association equilibrium constants ( K  A ) have been derived. The centre-to-centre distances ( α ) of the formed ion pairs have been considered to be equal to the Bjerrum's distance. The limiting ion conductivities ( λ  o  ± ) have been evaluated according to the method of Krumgalz and the experimental  λ  o  ±  values have been compared with the theoretical  λ  o  +  values calculated from the empirical equation of Gill. The thermodynamic functions, Gibbs energy (Δ G  o  A ), enthalpy (Δ H  o  A ), and entropy (Δ S  o  A ) for the ion-pair formation process as well as the activation energy of the ionic movement (Δ H  * ) have been evaluated.

Conductivity Studies of n -Tetrabutylammonium Tetraphenylborate in Acetone and Acetonitrile in the Temperature Range from 283.15 to 303.15K