The ionic product of water in concentrated tetramethylammonium chloride solutions

Sipos, P., Bódi, I., May, P.M. and Hefter, G. (1997) The ionic product of water in concentrated tetramethylammonium chloride solutions. Talanta, 44 (4). pp. 617-620.

Abstract

The ionic product of water, pKw = − log[H+][OH−] has been determined in aqueous solutions of tetramethylammonium chloride over the concentration range of 0.1–5.5 M at 25°C using high-precision glass electrode potentiometric titrations. pKw data relating to aqueous potassium and sodium chlorides at ionic strengths up to 5 M are markedly lower than the tetramethylammonium chloride results. These differences are almost certainly due to weak associations between potassium and (especially) sodium and hydroxide ions.