Electrical Conductivity of the Critical Binary Mixture Triethylamine–Water with Added Zn2+ and SO 2−4 Ions

Abstract

The binary liquids mixture triethylamine (1) + water (2) (TEA-W) has a lower consolute point at a critical composition of 32.27% mass fraction in triethylamine and critical temperature located at \(T_{c} \approx 291.426 K\). Below \({T}_{c}\), liquids are completely miscible, while at higher temperatures they separate into two liquid phases. The measurement of the conductivity versus temperature for three critical systems TEA-W, TEA-W + ZnSO₄ (5 × 10⁻⁴ mol·L⁻¹) and TEA-W + ZnSO₄ (10⁻³ mol·L⁻¹) has been performed along the coexistence curve in the one phase region, below the temperature of phase transition. The electrical conductivity behavior of an electrolyte depends on the ZnSO₄ concentration and temperature. The dependence of the electrical conductivity in temperature of the studied mixtures obeys Arrhenius law over the whole range of investigated parameters. The electrical conductivity of electrolytic system (TEA-W) + ZnSO₄ was compared to that our previous work the mixture (TEA-W) + KCl at the same salt concentration and TEA composition.