ACTIVITY MEASUREMENTS IN THE TERNARY-SYSTEM NABR-DEGREES-C(NACLO4+H2OAT 25)

The activity coefficients of sodium bromide in the ternary system NaBr + NaClO4 + H2O were determined at 25 degrees C and constant ionic str ength of 0.1, 0.5, 1, 2, and 3 mol-kg(-1) from emf of the cell without liquid junction ISE-Na \ NaBr(m(A)), NaClO4(m(B)), AgCl(S) \ Ag The e xperimental activity coefficients were comparatively analyzed by using the Harned, Scatchard, Pitzer and Lim-HOLL treatments. All these meth ods are adequate for the analysis of the experimental data. The result s have been compared with those of Lanier for the system: NaCl + NaClO 4 + H2O. The Gibbs excess energy of miring was obtained and qualitativ ely interpreted in terms of ionic interactions.