Spectrophotometric determination of acidity constants of salicylaldoxime in aqueous solution at 25 degrees C and ionic strength of 0.5 M controlled with NaCl

Spectrochim Acta A Mol Biomol Spectrosc. 2007 Apr;66(4-5):879-83. doi: 10.1016/j.saa.2006.05.004. Epub 2006 May 10.

Abstract

The equilibrium constants of salicylaldoxime in water at 25 degrees C, 0.5 M of ionic strength with NaCl and concentration of 1x10(-4) M were determined spectrophotometrically. The spectral data were processed using SQUAD program. The salicylaldoxime in acid medium has the value of pKa1=1.224+/-0.027. In alkaline medium the salicylaldoxime has the values of pKa2=8.551+/-0.024 and pKa3=11.728+/-0.016.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Hydrochloric Acid / chemistry*
  • Hydrogen-Ion Concentration
  • Kinetics
  • Osmolar Concentration
  • Oximes / analysis*
  • Oximes / chemistry
  • Sodium Chloride / chemistry*
  • Solutions
  • Spectrophotometry, Ultraviolet
  • Temperature*

Substances

  • Oximes
  • Solutions
  • salicylaldoxime
  • Sodium Chloride
  • Hydrochloric Acid