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Potentiometric determination of equilibrium constants of bases and perchlorates of protonated bases in glacial acetic acid using Superquad.
MedLine Citation:
PMID:  12664185     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The traditional method of calculating equilibrium constants in glacial acetic acid medium was developed by Kolthoff and Bruckenstein in 1957; thenceforth, and even presently, few alternatives have been made available to undertake such studies. This paper presents the results obtained with the use of the program Superquad to assess the equilibrium constants of various bases and their protonated perchlorate salts in glacial acetic media. A model of formation equilibria is proposed and fed into the program, considering the species present during an acid-base titration. The calculations of the equilibrium constants using Superquad for pyridine and diethylamine are statistically in agreement with those reported in the literature, (for pyridine: pK(B)=5.98+/-0.02, pK( PyHClO4)=5.47+/-0.02 and for diethylamine pK(B)=5.52+/-0.04, pK( DietHClO4)=4.52+/-0.07). With the use of Superquad, the values found for the aniline were pK(B)=6.95+/-0.06 and pK( AnilHClO4)=4.89+/-0.06.
Authors:
Giaan A Alvarez-Romero; Alberto Rojas-Hernández; Guillermo A Vázquez; Ma Teresa Ramírez-Silva
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Publication Detail:
Type:  Journal Article     Date:  2003-02-22
Journal Detail:
Title:  Analytical and bioanalytical chemistry     Volume:  375     ISSN:  1618-2642     ISO Abbreviation:  Anal Bioanal Chem     Publication Date:  2003 Mar 
Date Detail:
Created Date:  2003-03-28     Completed Date:  2003-12-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101134327     Medline TA:  Anal Bioanal Chem     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  826-30     Citation Subset:  -    
Affiliation:
Departamento de Química, Area de Química Analítica, Universidad Autónoma Metropolitana (Iztapalapa), San Rafael Atlixco #186, C.P. 09340 México, D.F., México.
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