Thermochimica Acta, Vol.239, 243-251, 1994
Thermodynamic of Ion-Pair Association .1. Conductance of Sodium Tetraphenylborate in 1-Alkanols
Conductance measurements are reported for sodium tetraphenylborate (STB) in methanol, ethanol, 1-propanol and 1-butanol at 298.15, 308.15 and 318.15 K. The experimental results were analyzed by the Fuoss-Shedlovsky equation. The limiting conductance LAMBDA0 and ion-pair association constant log K(A) increase with increasing temperature. Also, the LAMBDA0 values decrease in the order methanol > ethanol > 1-propanol > 1-butanol; the reverse is true for the log K(A) values. The thermodynamic functions of ion-pair association were evaluated and are discussed. The free energy change of association was found to be linear as a function of the number of methylene groups in the alkyl chain of the 1-alkanols. The thermodynamic parameters of transfer of STB from water to the 1-alkanols were calculated and are discussed.