Acta Chimica Slovaca (ACS) publishes papers on fundamental and applied aspects of chemistry, biochemistry, chemical technology, chemical engineering and process control, biotechnology and food technology. Welcome are also topics which include chemical aspects of materials, physical chemistry and chemical physics, analytical chemistry, macromolecular chemistry and biomedical engineering.

Thermodynamic characterization of acid cryolite systems

Michaela Benköová *, Emília Mališová, Ján Híveš

Department of Inorganic Technology, FCHPT, STU, Radlinského 9, 812 37 Bratislava, Slovakia

E-mail: * michaela.benkoova@stuba.sk

Abstract: Measuring of the electromotive force in molten system is used to characterize thermodynamic properties of the system at equilibrium. Values of the electromotive force are very important for the determination of activity and standard electrode potential. Investigation of the electromotive force of Al + TiB2 and Al-Al cell was the main aim of this work leading to the characterization of acid cryolite systems. The measurements were realized using a molten aluminum electrode and the electromotive force of an electrochemical cell was investigated in electrolytes at various molar ratios (NaF/AlF3) at equilibrium. Thermodynamic properties were measured in acid cryolite melts at three different temperatures: 800 °C, 900 °C, and 1000 °C, for all experiments.

Keywords: acid cryolite melts, aluminum electrode, electromotive force, molar ratio, standard electrode potential

Acta Chimica Slovaca, Vol. 15, No. 1, 2022, pp. 97—102, DOI: 10.2478/acs-2022-0011