title: The ionic product of water in concentrated tetramethylammonium chloride solutions.
abstract: The ionic product of water, pK(w) = - log[H(+)][OH(-)] has been determined in aqueous solutions of tetramethylammonium chloride over the concentration range of 0.1-5.5 M at 25 degrees C using high-precision glass electrode potentiometric titrations. pK(w) 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.
authors.affiliation: School of Physical Sciences Engineering and Technology, Murdoch University, Murdoch, WA 6150, Australia.
authors.forename: P
authors.initials: P
authors.lastname: Sipos
authors.forename: I
authors.initials: I
authors.lastname: Bódi
authors.forename: P M
authors.initials: PM
authors.lastname: May
authors.forename: G T
authors.initials: GT
authors.lastname: Hefter