Studies on the Chelation of 3-Hydroxynaphthalene -2- Carboxylic Acid with Zinc(II), Cadmium(II) and Uranyl(II)

Department of Chemistry, Guru Nanak Dev University, Amritsar Manuscript received 17 January 1977; accepted 18 March 1977 The stability constants of the complexes of 3-hydroxynaphthalene-2-carboxylic acid with Zn(II), Cd(II) and UO2(II)have been obtained potentiometrically in 50 vol % dioxane-water medium at three temperatures and ionic strength 0.1 M (KNO2) following the Bjerrum-Calvin technique as applied by Irving and Rossotti. The values of overall changes in \(\bigtriangleup\)G, \(\bigtriangleup\)H and \(\bigtriangleup\)S have been evaluated.The thermodynamic stability constants have also been reported by determining the stability constants of the complexes at 30° and four different ionic strengths and then extrapolating to zero ionic strength.