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Spectrophotometric studies of complexing equilibria of hafnium with some azo-dyes in aqueous solution

Authors
Journal
Microchemical Journal
0026-265X
Publisher
Elsevier
Publication Date
Volume
24
Issue
4
Identifiers
DOI: 10.1016/0026-265x(79)90090-0

Abstract

Abstract Hafnium forms three chelates 1:2 (M:L) (pH 1.0, 520 nm), 1:1 (pH 1.4, 520 nm), and 2:1 (pH 2.0, 520 nm) with PAR; and 1:2 chelate with EBB (pH 0.8, 590 nm), SVRS (pH 1.2, 560 nm), and CLM (0.25 M, 590 nm), respectively. In all the systems, only for 1:2 chelates, the exact nature of the equilibrium involved in chelation has been evaluated. The kinetic study and the number of protons liberated during chelation reaction have been studied. From the values of the equilibrium constant, the values of absolute stability constants for these complexes have also been evaluated.

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