title: The second acidic constant of salicylic acid.
abstract: The second dissociation constant of salicylic acid (H2L) has been determined, at 25 degrees C, in NaCl ionic media by UV spectrophotometric measurements. The investigated ionic strength values were 0.16, 0.25, 0.50, 1.0, 2.0 and 3.0 M. The protolysis constants calculated at the different ionic strengths yielded, with the Specific Interaction Theory, the infinite dilution constant, log beta1(0) = 13.62 +/- 0.03, for the equilibrium L2- + H+ <==> HL-. The interaction coefficient between Na+ and L2-, b(Na+, L2-) = 0.02 +/- 0.07, has been also calculated.
authors.affiliation: Dipartimento di Chimica, Università della Calabria, via P. Bucci, Arcavacata di Rende, 87036 Rende (CS), Italy. r.porto@unical.it
authors.forename: Raffaella
authors.initials: R
authors.lastname: Porto
authors.forename: Gaetano
authors.initials: G
authors.lastname: De Tommaso
authors.forename: Emilia
authors.initials: E
authors.lastname: Furia
mesh_terms: D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D011199:Potentiometry; D020156:Salicylic Acid / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D017186:Titrimetry
chemical_list: D012965:Sodium Chloride; D020156:Salicylic Acid