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Complex Formation of Lead (II) with Bromopyrogallol Red
Author(s) -
Dhupar S. C.,
Srivastava K. C.,
Banerji Samir K.
Publication year - 1973
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.197300016
Subject(s) - chemistry , reagent , standard enthalpy of formation , ion , gibbs free energy , molar absorptivity , complex formation , stability constants of complexes , lead (geology) , analytical chemistry (journal) , inorganic chemistry , thermodynamics , chromatography , organic chemistry , geomorphology , geology , physics , optics
The complex formation of lead with Bromopyragallol Red has been studied spectrophotometrically in an attempt to establish composition, stability, thermodynamic parameters and optimum condition for determining small amounts of lead. The blue complex of lead had λ max at 630 nm (against a reagent blank). The composition as determined by different methods is 1:1 at p H 5.5±0.1. The mean value of log K , free energy (ΔG), the heat content (ΔH) and entropy change (ΔS) of the complex are found to be 6.28, −10.46 kcal/mole and 6.31 e. u . respectively at 25°C. The molecular extinction coefficient and Sendall's sensitivity is 5000 and 0.0140 μ g of lead/ cm 2 . The effect of diverse ions was examined with eighteen cations and ten anions, in the determination of lead.