title: The acidic constants of 2-hydroxybenzohydroxamic acid in NaClO4 solutions at 25 degrees C.
abstract: The protolysis equilibria of 2-hydroxybenzohydroxamic acid, H2SAX, have been studied at 25 degrees C in different ionic media by potentiometric titration with a glass electrode. The media were 0.513, 1.05, 2.21 and 3.5 mol/kg NaClO4. The constants beta(-p)(H2SAX<==>H(2-p)SAX(-p)+pH+), combined with salting effects of NaClO4 on H2SAX deduced from solubility determinations, were processed by the specific interaction theory, SIT, to give equilibrium constants at infinite dilution, log beta(-1)(o) = -7.655 +/- 0.013 and log beta(-2)(o) = -17.94 +/- 0.04, as well as specific interaction coefficients b(HSAX-,Na+) = 0.12 +/- 0.01 and b(SAX2-,Na+) = 0.17 +/- 0.02, molal(-1).
authors.affiliation: Dipartimento di Chimica, Università Federico II, Via Cinthia 45, 80126 Napoli, Italy. ciavatta@chemistry.unina.it
authors.forename: Liberato
authors.initials: L
authors.lastname: Ciavatta
authors.forename: Gaetano
authors.initials: G
authors.lastname: De Tommaso
authors.forename: Mauro
authors.initials: M
authors.lastname: Iuliano
mesh_terms: D006877:Hydroxamic Acids / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry; D012457:Salicylamides / Q000737:chemistry; D017670:Sodium Compounds / Q000737:chemistry; D013696:Temperature; D017186:Titrimetry
chemical_list: C492257:2-hydroxybenzohydroxamic acid; D006877:Hydroxamic Acids; D010472:Perchlorates; D012457:Salicylamides; D017670:Sodium Compounds; C005703:salicylhydroxamic acid; C031068:sodium perchlorate