Silva, Astrea F. de S.Ortega, Manuel M.Melios, Cristo B. [UNESP]Pezza, Leonardo [UNESP]de Moraes, Mercedes [UNESP]Tenan, Mario AlbertoOliveira, Andre F.2014-05-202014-05-202010-01-01Journal of The Brazilian Chemical Society. São Paulo: Soc Brasileira Quimica, v. 21, n. 1, p. 135-U58, 2010.0103-5053http://hdl.handle.net/11449/25863The molar single ion activity coefficient (y(F)) of fluoride ions was determined at 25 degrees C and ionic strengths between 0.100 and 3.00 mol L(-1) NaClO(4) using an ion-selective electrode. The activity coefficient dependency on ionic strength was determined to be Phi(F) = log y(F) = 0.2315I-0.041I(2). The function Phi(F)(I), combined with functions obtained in previous work for copper (Phi(Cu)) and hydrogen (Phi(H)), allowed us to make the estimation of the stoichiometric and thermodynamic protonation constants of some halides and pseudo-halides as well as the formation constants of some pseudo-halides and fluoride 1:1 bivalent cation complexes. The calculation procedure proposed in this paper is consistent with critically-selected experimental data. It was demonstrated that it is possible to use Phi(F)(I) for predicting the thermodynamic equilibrium parameters independently of Pearson's hardness of acids and bases.135-U58engthermodynamic activityion-selective electrode analysisstability constantsArtigo10.1590/S0103-50532010000100020S0103-50532010000100020WOS:000275106400019Acesso abertoS0103-50532010000100020.pdf59789085918535240000-0003-0197-7369