In a previous paper, various properties of the mixture acetic acid + triethylamine were investigated and explained in terms of a very strong attractive interaction between a 1:1 complex acid + amine and the cyclic dimer of acetic acid, leading to a 3:1 aggregate of extreme thermodynamic stability. This gives rise to phase separation at negative values of the excess Gibbs energy. In the present series of articles, an attempt is made to present a unified treatment of systems of carboxylic acid + amine, with emphasis on triethylamine, but with inclusion of some recent results involving the tri-n-butylamine as well as secondary and primary n-butylamine. In this paper we present experimental results on solid-liquid equilibria of formic, propionic, and trimethylacetic (pivalic) acids + triethylamine and viscosities of formic, trifluoroacetic, propionic, and trimethylacetic acids + triethylamine, propionic and trimethylacetic acids + tri-n-butylamine, propionic acid + di-n-butylamine, and propionic acid + n-butylamine.

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