Determination of acidity constants of acid-base indicators by second-derivative spectrophotometry.
A method for calculation of acid-base dissociation constants of monoprotic weak organic acids whose acid and base species have overlapping spectra from absorptiometric and pH measurements is described. It has been shown that the second-derivative spectrophotometry can effectively be used for determining the dissociation constants, when dissociation constants obtained for methyl orange and bromothymol blue were compared with the values given in the literature.
Kara
D
D
Department of Chemistry, Faculty of Art and Science, University of Balikesir, Turkey. dkara@balikesir.edu.tr
Alkan
M
M
D001391:Azo Compounds / Q000737:chemistry*; D001979:Bromthymol Blue / Q000737:chemistry; D003627:Data Interpretation, Statistical; D006863:Hydrogen-Ion Concentration; D013054:Spectrophotometry, Atomic / Q000379:methods*
D001391:Azo Compounds; C100258:methyl orange; D001979:Bromthymol Blue