Extraction of HCl, HBr, HNO3, HClO4, H2SO4 and CH3COOH by 4-(5-Nonyl)pyridine and 2-hexylpyridine in benzene and determination of their pKBH+ values

• DOI: 10.1007/bf02518001
• Publication Date: 2006-11-07T22:00:58Z
• Authors: Shamim A. Chaudhri; R. Ahmed; M. Ejaz
• Keywords: 01 natural sciences; 0104 chemical sciences

The extraction of HCl, HBr, HNO3, HClO4, H2SO4 and CH3COOH into solutions of 4-(5-nonyl)pyridine (NPy) and 2-hexylpyridine (HPy) dissolved in benzene has been studied. The results show that the larger, less basic anions extract better (ClO 4 − >CH3COO−≥NO 3 − >Br−>Cl−>HSO 4 − ) due to their low aqueous hydration. The ionization constants of NPyH+ and HPyH+ as determined spectrophotometrically were found to be 5.97±0.06 and 5.94±0.05, respectively, at 25°C.