2 - Hydroxy - 4 - n - propoxy - 5 - bromoacetophenone oxime ( HnPBAO ) as analytical reagent for the gravimetric determination of Pd ( II )

2-Hydroxy-4-n-5-bromoacetophenone oxime (HnPBAO) was developed as a new analytical reagent for the gravimetric determination of divalent palladium ion. In the pH range of 2.0 to 5.0, the reagent gave a light brown precipitate with Pd(II). Job’s method and mole ratio method revealed that the stoichiometry of the complex is 1:2 (metal : ligand). Beer’s law is obeyed upto 37.25 ppm of Pd(II) at 450 nm. Molar absortivity and Sandell’s sensitivity at 450 nm were found to be 7.23 x 102 lt mol-1cm-1 and 0.147 μg/cm2 respectively. The stability constant of Pd(II)HnPBAO complex is found to be 1.27 x 1010. Gibb’s free energy change for complex formation reaction was found to be -13.86 kcal/mol. The reagent can be used for analysis of Pd(II) in palladised carbon and in a binary mixture containing Pd(II) and Ni(II).