The electrical conductivity of the HCl + KCl + H 2 O ternary system has been measured in a wide range of compositions (0 mol‚dm -3 < c HCl < 6 mol‚dm -3 and 0 mol‚dm -3 < c KCl < 1.2 mol‚dm -3 ) and temperatures (15 °C < t < 45 °C) making use of an automated station for conductometric titration based on the "electrodeless conductivity" technique. The experimental data obtained have been fitted to a polynomial in the HCl molar concentration, the KCl molar concentration, and the temperature. As a result, an empirical model enabling the interpolation of the conductivity of the chemical system under study within the limits of the variables investigated has been proposed.
The electrical conductivity of H 2 TiF 6 (1) + HF (2) + H 2 O (3) mixtures was measured in a wide range of mass fractions (0% < w 1 < 55% and 0% < w 2 < 11%) and temperature (15°C < t < 35°C) by means of an automatic system based on the "electrodeless conductivity" technique. The results were fitted to a polynomial equation in w 1 , w 2 , and t using a Mathematica package (Tkondu). The resulting model is able to reproduce experimental data with an uncertainty below 5%.
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