Abstract:
Spectrophotometric measurements of the basic indicator p-naphthol-benzein (PNB) in benzene in the presence of trichloroacetic acid were made. Tri-n-butylammonium trichloroacetate salt was added to a mixture of the indicator and trichloroacetic acid and the extent of the reaction was measured. It is assumed that ion-pair is formed in absence of salts. This indicator showed no reaction with added salts in the presence of acid, at least up to an indicator concentration of 5x10-4M. When the PNB concentration was increased to 5x10-3M, and the concentration of CCI3 COON was the same, the addition of tri-n-butyl ammonium trichloro acetate produced small increases in the concentration of the free base. The changes in absorbance due to added salt were too small to justify calculations of the values for any homoconjugate ion-pair stability constants.
Page(s):
110-113
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 23, Issue: 4, Year: 1980