Abstract
Solute-solvent interactions of L-Histidine and 1,10- Phenanthroline have been studied in varying compositions (0-60% v/v) of 1-propanol-water mixtures using pH-metric technique. The ionic strength of 0.16 mol. L-1 is maintained at 303±0.1 K and protonation constants were calculated by using the computer program MINIQUAD75. The best suited chemical model of protonation equilibria was selected based on the statistical parameters. The solvent effect on log K values increased with the inverse of dielectric constants of 1-proponol-water mixtures and the trend was explained based on operation of electrostatic forces on protonation equilibria. This study also discusses the distribution of species and effect of influential parameters on the protonation constants.
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