Activity coefficients and relative partial molal enthalpies of substituted anilines in aqueous perchloric acid solutions

Abstract

Activity coefficients and relative partial molal enthalpies have been deduced from measurements of the solubilities of 2,4-dinitroaniline, 2,6-dichloro-4-nitroaniline, and 2,4-dichloro-6-nitroaniline in aqueous perchloric acid at four temperatures. The results are discussed in relation to the Hammett acidity function H₀ for aqueous perchloric acid and enthalpies of protonation of Hammett bases as a function of perchloric acid concentration.