Solvent Effects on Acid-Base Equilibria

Department of Chemistry, Indian Institute of Technology, Madras-36

Received 12 October 1971

Equilibrium constants for acidlbase equilibria of the type

                                   RC₆H₄NH₃⁺ + C₆H₃NH₂ = C₆H₃NH₃⁺ + RC₆H₄NH₂

have been determined by an indicator method in a few solvents and the effect of solvent on such equilibria is discussed. It has been shown that specific solute-solvent interactions as examplified by the free energies of transfer of the various species involved in the equilibria must also be considered in addition to the electrostatic effects in understanding such equilibria.