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has been cited by the following article:

• TITLE: Potentiometric Study of Dissociation Constants of Dihydroxybenzoic Acids at Reduced Ionic Strengths and Temperatures

  AUTHORS: Jörgen Rosenqvist, Caroline M. Jonsson

  KEYWORDS: 2, 3-Dihydroxybenzoic Acid, 3, 4-Dihydroxybenzoic Acid, Dissociation Constant, pKa, Temperature, Ionic Strength, Surface Water

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.8 No.2, February 4, 2017

  ABSTRACT: The dissociation behavior of two dihydroxybenzoic acid isomers, 2,3-DHBA and 3,4-DHBA, at 281 K and 293 K was determined by potentiometric titrations in 0.01 M NaCl and 0.03 M NaCl. Results showed that the dissociation enthalpy for the carboxylic group in DHBA is close to zero, resulting in dissociation constants that do not vary appreciably with temperature, whereas the dissociation constants for the first hydroxyl group vary significantly with temperature. Increasing ionic strength was found to result in increased values for the second dissociation constant, whereas the effect on the first dissociation constant was less clear.