Abstract
The stability constants of two dicarboxylic acid ligands (1,7- Bis (2¢-benzoic acid)-1,4,7-trioxaheptane (L1) and 1,10-Bis(2¢- benzoic acid)-1,4,7,10-tetraoxadecane(L2)) with Na+, K+, Ca2+ and Mg2+ in ethanol - water solvent mixtures were determined. The ratio of ligand / metal in these complexes is 1/1, and the stability constants of K+ with L1 and L2 are higher than Na+ and the stability constants of Ca2+ with L1 and L2 are higher than Mg2+ complexes. These studies also showed that the stability constants of Na+ and K+ complexes with L1 and L2 increases by an increase in the mole fraction of ethanol in the solvent mixtures. Key Words: Stability Constant, 1,7-Bis (2¢-benzoic acid)-1,4,7- trioxaheptane and 1,10-Bis(2¢-benzoic acid)-1,4,7,10- tetraoxadecane, Potentiometry
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