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Stepwise Formation of Some Bivalent Metal Chelates with Sodium Alizarin Sulphonate
Author(s) -
Govil Pradip K.,
Dwivedi Chandra D.,
Banerji Samir K.
Publication year - 1972
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197200066
Subject(s) - chemistry , ionic strength , stability constants of complexes , protonation , inorganic chemistry , chelation , ionic bonding , metal , bivalent (engine) , sodium perchlorate , metal ions in aqueous solution , ligand (biochemistry) , titration , perchlorate , ion , aqueous solution , organic chemistry , electrochemistry , receptor , electrode , biochemistry
The stepwise protonation constants of the ligand and the stability constants of Alizarin Red S with some bivalent metal ions, Pb 2+ , Cu 2+ , Zn 2+ , and Hg 2+ have been determined at 30° and at various ionic strengths viz. 0.02, 0.05, 0.15 and 0.20, maintained by sodium perchlorate solution. The formation of the chelate is evident from the shift between the (i) ligand and (ii) ligand and metal titration curves. From the values of the stepwise protonation constants and metal ligand stability constants at various ionic strengths, thermodynamic formation constants were evaluated by extrapolation to zero ionic strength. The order of stability constants was found to be: Cu > Pb > Zn > Hg