A conductivity study of dilute aqueous solutions of tetramethylammonium hexacyanoferrate(III), tetraethylammonium hexacyanoferrate(III) and benzyltrimethylammonium hexacyanoferrate(III)

Electrical conductivities of tetramethylammonium hexacyanoferrate(III), tetraethylammonium hexacyanoferrate(III) and benzyltrimethylammonium hexacyanoferrate(III) in dilute aqueous solutions, in the 278.15 K to 313.15 K temperature range are reported. These conductivities are examined in terms of the molecular model which includes an existence of three ion species in the solution, the principal cation and anion and the additional anion formed by the association between them. Based on this molecular model, the representation of conductances was performed using the Quint-Viallard conductivity equation and the Debye-Hückel expression for activity coefficients. The thermodynamic of ion pair formation is discussed in terms of ion-solvent interactions.