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Spectrophotometric Determination of Dissociation Constants of Thiovioluric Acid and the Stability Constant of its Fe(II) Complex
Author(s) -
Singh B. R.,
Ghosh R.
Publication year - 1981
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198100023
Subject(s) - chemistry , ionic strength , dissociation constant , acid dissociation constant , absorbance , dissociation (chemistry) , stability constants of complexes , ionic bonding , equilibrium constant , analytical chemistry (journal) , molar absorptivity , inorganic chemistry , ion , chromatography , aqueous solution , organic chemistry , receptor , physics , optics , biochemistry
Spectrophotometric studies of Fe(II)‐thiovioluric acid system indicates the presence of a 1:2 complex in the p H range 4.0–6.5. The apparent equilibrium constant (K′ 1 ) has been determined by general absorbance‐extinction concentration scheme. The first and second dissociation constants of the acid have been studied at an ionic strength of 0.1 M while the third dissociation constant has been determined at I = 1 M . The effects of sudden p H change and buffer compositions on the dissociations have also been investigated. The stability constant of the complex has been calculated from the apparent equilibrium constant at ionic strength of 0.1 M . The stability constant works out to be 15.67 at p H 5.5.