Determinação das constantes de dissociação/ionização da di-2-piridil cetona benzoilhidrazona (DPKBH) em diferentes porcentagens de etanol

Abstract

ions in the presence of organic species found in natural waters.So as to better understand the DPKBH properties In ethanol, it was necessary to determine the dissociation/ionization constant in different percentages of ethanol (lO, 19, 29 and 48%). In these ethanol percentages, through absolute pH measurements, pKs of DPKBH could be the found by using the potentiometric technique, and in 10 and 48% of ethanol the pKs of DPKBH were determined with pH measurements associated to absorbance of the species present in the equilibria by using the spectrophotometric technique.In appropiate percentage of ethanol the behavior of the glass electrode was previously determined.