3,4,5, Trihydroxybenzoic acid (Gallic acid) is a strong chelating agent and forms complexes of high stability constants with Iron(III), Ligand concentration and pH dependence: of kinetics of formation of monogallatotetraaquoiron(III) complex were studied in various acetate buffers of pH 3.84 to 5.0. Pseudo first order rate constants (with ligand in excess) were found to increase with pH as well as increasing, concentration of the ligand but level off at higher concentration of ligand. A rate law was derived and the mechanism for the formation of monogallatotetraaquoiron(III) was proposed which complies with the rate law.
M SAQIB QURESHI ,S ARIF KAZMI ,
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