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The liquid junction potential in potentiometric titrations. X. The calculation of potentials across liquid junctions of the type AY vertical bar AY+HY+BY+BY(Z(B))+A(y)L for Emf cells where strong or weak complexes are formed at constant ionic strength and -log(10)[H(+)]<= 7
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Inorganic Chemistry.
2006 (English)In: Journal of Solution Chemistry, ISSN 0095-9782, E-ISSN 1572-8927, Vol. 35, no 8, 1085-1107 p.Article in journal (Refereed) Published
Abstract [en]

Equations are derived for the calculation of the total potential anomalies in Emf cells with liquid junctions (Delta E(J)) in mV and at 25.0 degrees C, defined as Delta E(J) = (+or-)(59.16/z(j)) log(10) f(JTS2) + E(D) + E(Df) where z(j) = the charge number of the potential determining ion, J, and TS2 = terminal solution 2 equivalent to test solution. This definition includes the activity factor (f(J)) contributions to the measuring electrode, the ideal diffusion potential (ED) and the contribution of the activity factors to E(D), denoted by E(Df). The cell assumed to contain an equilibrium solution which exists in the system, HY-BY(z(B))-A(y)L in the ionic medium (A(+), Y(-)) with the experimental condition I (ionic strength) = CM, constant, in the mixed solutions. Here, L(y)-denotes the ligand and B(z(B)+), the metal ions. The reasons for the dependence of the equilibrium constants on the ionic medium are given. The change of the equilibrium constants with the experimental conditions in a given ionic medium is also explained.

Place, publisher, year, edition, pages
2006. Vol. 35, no 8, 1085-1107 p.
Keyword [en]
liquid junction potential, ideal diffusion potential, ionic activity factors, protolysis, total cell Emf, specific interaction theory
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-37691DOI: 10.1007/s10953-006-9051-zISI: 000241456000004OAI: diva2:434917
QC 20110816Available from: 2011-08-16 Created: 2011-08-16 Last updated: 2011-08-16Bibliographically approved

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