Open AccessSOLUTION STATE AND THERMODYNAMIC STUDIES ON BINARY COMPLEXES OF THE TH(IV) WITH SOME HYDROXY ACIDS
Author(s) -
Sangita Sharma,
K. M. JOSHI
Publication year - 2015
Publication title -
latin american applied research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.123
H-Index - 23
eISSN - 1851-8796
pISSN - 0327-0793
DOI - 10.52292/j.laar.2015.409
Subject(s) - chemistry , titration , aqueous solution , dissociation constant , malic acid , ionic strength , deprotonation , stability constants of complexes , equilibrium constant , salicylic acid , acid dissociation constant , thermodynamics , ionic bonding , inorganic chemistry , organic chemistry , ion , biochemistry , physics , receptor , citric acid
A Solution state study on complexation behavior of Th(IV) with hydroxy acids (malic acid, lactic acid, salicylic acid and mandelic acid) has been carried out using the Irving–Rossotti titration technique in aqueous media and mixed media at different temperatures and ionic strengths. The dissociation constant and stability constants (logβ) of the resulting complexes have been calculated with the Fortran IV program BEST using the method of least squares and considering the BESTFIT model. Species distribution curves of complexes have been plotted as function of pH using the SPEPLOT Fortran IV program to visualize various species in equilibrium in the pH range 2–14. Thermodynamic properties were calculated and negative ∆G, ∆H and ∆S values indicated that complex formation is a spontaneous and exothermic process at these temperatures. To understand more about these equilibriums, the stability of these complexes was studied in presence of various systemic errors.