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The kinetics of the reaction between magnesium and EBT
Author(s) -
Koren Ruth,
PerlmutterHayman Berta,
Shinar Ruth
Publication year - 1974
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550060105
Subject(s) - chemistry , protonation , ligand (biochemistry) , magnesium , kinetics , reaction rate constant , proton , inorganic chemistry , reaction rate , ethanol , medicinal chemistry , ion , organic chemistry , catalysis , biochemistry , physics , receptor , quantum mechanics
The kinetics of the reaction between Mg 2+ and Eriochrome‐Black‐T (EBT) has been investigated in the pH range between 7.05 and 9.0, in the presence of 12% ethanol. The reaction is found to consist of two parallel paths, one involving the tervalent unprotonated ligand, and one its monoprotonated form. The rate constant for the unprotonated ligand has a “normal” value, whereas that for the protonated form is much lower. The numerical value of the rate constant for the unprotonated ligand obtained from results at a magnesium concentration of 10 −3 M and a pH up to 9.0 is, however, inconsistent with that obtained from results at [Mg 2+ ] = (1 to 4) × 10 −3 M and pH up to 8.1. This can be explained, at least partially, if we assume the intermediate MgHD to lose its proton not only to H 2 O, but also to other bases present in the solution.