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Autoprotolysis Constants and Standardization of pH Measurements in Tetrahydrofuran‐Water Mixtures
Author(s) -
Barbosa José,
Barrón Dolores,
Butí Salvador
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199907)11:9<627::aid-elan627>3.0.co;2-v
Subject(s) - tetrahydrofuran , standardization , chemistry , analytical chemistry (journal) , environmental chemistry , organic chemistry , computer science , solvent , operating system
Standard emf for the cell Pt/Ag/AgCl/HCl in THF‐water/GE (glass electrode) in tetrahydrofuran‐water mixtures containing 0–70% (w/w) of tetrahydrofuran and values of the autoprotolysis constants, K ap , of these media were obtained. The influence of variations in the solvent composition on pK ap values was evaluated. The resulting equations enables us to determine pK ap values in any tetrahydrofuran‐water mixture, and thus permit one to establish the pH scale in these mixtures. The quasilattice quasichemical (QLQC) theory of preferential solvation was applied to obtain the degree of preferential solvation of hydrogen ions in these media, in order to explain the variation of the pK ap values obtained in the tetrahydrofuran‐water mixtures studied.