The equations of concentration dependence of the binary systems’ equilibrium properties divided by the authors into two groups are used to describe chemical equilibrium of the acetals formation reaction. The work determines the peculiarity to describe composition of such systems. Experimentally method of gas-liquid chromatography studies balance of reaction of acetal formation in two systems. The equations of specific output, a logarithm of an empirical equilibrium constant and degree of metamorphosis of components in an equilibrium admixture are offered at distinction of their stoichiometrical coefficient. Calculations of constant parameters of mathematical models under experimental data are carried out.

Key words: double liquid system, acetals formation, chemical equilibrium, constant of equilibrium, gas-liquid chromatography, output of reaction.