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Journal of Chemistry
Volume 2015, Article ID 540368, 13 pages
http://dx.doi.org/10.1155/2015/540368
Research Article

An Exact Method to Determine the Conductivity of Aqueous Solutions in Acid-Base Titrations

1Laboratorio R-105/R-107, Área de Química Analítica, Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, Avenida San Rafael Atlixco 186, Colonia Vicentina, 09340 México, DF, Mexico
2Área Ingeniería de Materiales, Departamento de Materiales, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Azcapotzalco, Avenida San Pablo 180, Colonia Reynosa-Tamaulipas, 02200 México, DF, Mexico

Received 6 November 2014; Accepted 8 January 2015

Academic Editor: Patricia Valentao

Copyright © 2015 Norma Rodríguez-Laguna et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Several works in the literature show that it is possible to establish the analytic equations to estimate the volume of a strong base or a strong acid ( and , resp.) being added to a solution of a substance or a mix of substances during an acid-base titration, as well as the equations to estimate the first derivative of the titration plot , and algebraic expressions to determine the buffer capacity with dilution . This treatment allows establishing the conditions of thermodynamic equilibria for all species within a system containing a mix of species from one or from various polyacid systems. The present work shows that it is possible to determine exactly the electric conductivity of aqueous solutions for these Brønsted acid-base titrations, because the functional relation between this property and the composition of the system in equilibrium is well known; this is achieved using the equivalent conductivity values of each of the ions present in a given system. The model employed for the present work confirms the experimental outcomes with the H2SO4, B(OH)3, CH3COOH, and H3PO4 aqueous solutions’ titration.