Potentiometric pH Measurements of Acidity Are Approximations, Some More Useful than Others

• Robert de Levie ^[1]
  1. [1] Bowdoin College

     Bowdoin College

     Town of Brunswick, Estados Unidos

     
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 87, Nº 11 (November), 2010, págs. 1188-1194
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • A recent article by McCarty and Vitz “demonstrating that it is not true that pH = −log[H+]” is examined critically. Then, the focus shifts to underlying problems with the IUPAC definition of pH. It is shown how the potentiometric method can provide estimates of both the IUPAC-defined hydrogen activity and the hydrogen ion concentration, using the same assumptions and with similar inherent uncertainties. Moreover, it is argued that the original Sørensen definition of pH as −log[H+] is preferable over the current one.