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    pH and the surface tension of water

    Year: 2014

    Journal: JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol. 422, p 54-57, 20150722

    Authors: Beattie, James K.; Djerdjev, Alex M.; Gray-Weale, Angus; Kallay, Nikola; Luetzenkirchen, Johannes; Preocanin, Tajana; Selmani, Atida

    Organizations: Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia; Univ Melbourne, Sch Chem, Melbourne, Vic 3000, Australia; Univ Zagreb, Fac Sci, Dept Chem, HR-10000 Zagreb, Croatia; Karlsruher Inst Technol, Inst Nukl Entsorgung, D-76433 Eggenstein Leopoldshafen, Germany

    Despite the strong adsorption of hydroxide ions, the surface tension of water is almost independent of pH between pH 1 and 13 when the pH is adjusted by addition of HCl or NaOH. This is consistent with the Gibbs adsorption isotherm which measures the surface excess of all species in the double layer, if hydronium ions and hydroxide ions are adsorbed and sodium and chloride ions are not. The surface tension becomes pH dependent around pH 7 in millimolar NaCl or KCl solutions, for now sodium ions can replace hydronium ions as counterions to the adsorbed hydroxide ions. (c) 2014 Elsevier Inc. All rights reserved.