Abstract

Precise measurements of electrolytic conductivities (Λ), densities (ρ), viscosities (η), and refractive index (nD)
of an ionic liquid benzyltrimethylammonium chloride in 1-hexanol, 1-heptanol, and 1-octanol have been done.
Densities and viscosities measurements have been carried out at different temperatures (T=298.15, 303.15, and
308.15 K) and conductivities and refractive index measured at 298.15 K. The limiting molar conductivities (Λ0),
association constants (KA), and the distance of closest approach of the ions (R) have been evaluated using
Fuoss conductance equation (1978). The Walden product is obtained and discussed. However, the deviation of
conductometric curves (Λ vs. √c) from linearity for the electrolyte in 1-heptanol and 1-octanol, and therefore,
the corresponding conductance data have been analyzed by the Fuoss-Kraus theory of triple-ions. The observed
molar conductivities have been explained by the ion pair (M+ + X−  ⇀↽  MX) and triple-ion (2M+ + X−  ⇀↽ 
M2X+; M+ + 2X−  ⇀↽  MX2−) formation. The limiting apparent molar volume ( 0
vφ ) and the experimental
slope ( SV
* ), interpreted in terms of solute–solvent and solute-solute interactions, respectively, have been derived
from the Masson equation. The viscosities data have been analyzed using Jones-Dole equation to derive the
viscosity B- and A-coefficient, which also interpreted in terms of solute–solvent and solute–solute, respectively.
The molar refractive index (RM) and limiting molar refractive index ( RM
0 ) have been evaluated from the values of
refractive index using Lorentz-Lorenz equation.