THE IONIC PRODUCT OF WATER IN CONCENTRATED TETRAMETHYLAMMONIUM CHLORIDE SOLUTIONS

The ionic product of water, pK(w) = -log[H+][OH-] has been determined in aqueous solutions of tetramethylammonium chloride over the concentr ation range of 0.1-5.5 M at 25 degrees C using high-precision glass el ectrode potentiometric titrations. pK(w) data relating to aqueous pota ssium and sodium chlorides at ionic strengths up to 5 M are markedly l ower than the tetramethylammonium chloride results. These differences are almost certainly due to weak associations between potassium and (e specially) sodium and hydroxide ions. (C) 1997 Elsevier Science B.V.