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Applicability of excess acidity functions in low‐acidity media
Author(s) -
García Begoña,
Leal José M.
Publication year - 1991
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.610040704
Subject(s) - chemistry , acidity function , perchloric acid , extrapolation , inorganic chemistry , acid dissociation constant , organic chemistry , aqueous solution , mathematical analysis , mathematics
It is demonstrated that excess acidity functions do not correspond well to the pH scale in dilute solutions. Acidity constants, p K BH +, of seven moderately weak bases were determined; they were calculated by means of excess acidity functions, since the corresponding ionizations occur at acidity levels where the pH scale is partly used. The excess acidity method permitted extrapolation of measurements made in concentrated acids down to dilute solutions only up to about 5% (w/w) perchloric acid.