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Published on: May 3, 2015
Effect of ionic strength on the formal potential of the glass electrode in various saline media
I Brandariz1, T Vilariño, P Alonso
1Departamento de Quimica Fundamental e Industrial, Facultad de Ciencias, Universidad de La Coruña, Campus da Zapateira s/n, E-15701 La Coruña, Spain.
Abstract:
We examined the variation with ionic strength (I, adjusted with KCl, KNO(3), KBr, NaCl or NaClO(4)) of the formal potential (E(const)) for glass electrodes exhibiting a Nernstian response (i.e. E(cell)=E(const)-slog[H(+)]). For this purpose, we investigated the different factors included in the formal potential, so we obtained reported values for the liquid junction potential as a function of ionic strength and determined the logarithm of the activity coefficient for the proton in various saline media, using Pitzer equations.
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