Ion association of anhydrous ferric chloride in primary alcohols at different temperatures

Abstract

Conductance measurements at nine different temperatures between 283.15 and 323.15 K are reported for anhydrous ferric chloride (FeCl3) in primary alcohols: methanol (MeOH), ethanol (EtOH), 1-propanol (1-PrOH) and 1-butanol (1-BuOH). Also, to analyze conductivity data, density and viscosity values of the primary alcohols have been determined experimentally at the same temperatures. The ion association constants (K-A) between ferric (Fe3+) cation and chloride (Cl-) anion were calculated by using conductivity data in terms of the Robinson-Stokes equations. The KA values calculated for ferric chloride in primary alcohols decreased in the order of 1-BuOH > 1-PrOH > EtOH > MeOH. This was equivalent to the ion association constants increasing with a decrease in the relative permittivity of the alcohols. The KA values increased with the increase in temperature for ferric chloride in primary alcohols.