Oxoacidity scales for melts based on alkali- and alkaline-earth metal halides

2 OXOACIDITY SCALES FOR MELTS BASED ON ALKALI- AND ALKALINE-EARTH METAL HALIDES 

As heterogeneous equilibria in solid oxide-ionic solvent systems are the most investigated in molten chlorides, the general acid-base scale for such melts may be constructed using the solubility method. 

As follows from Part 1, the ionic melts based on molten alkali metal halides are referred to the solvents of the Second Kind (Kind II), and, therefore, the acid-base ranges for these media are half-open (see Fig. 1.1.1, scheme N3). Therefore, to form an idea of the relative oxoacidic properties of the studied chloride melts it is enough to know their oxobasicity indices. The necessary experimental parameters obtained at 600 °C are presented in Table 1.3.1. The data in this Table show that the KCl-LiCl eutectic melt possesses appreciable acidic properties, the corresponding oxobasicity index being equal to 3.2. 

Solubility products of MgO in some chloride melts at 600 °C and their oxobasicity indices (with respect to the CsCl-KCl-NaCl eutectic) 

the oxoacidic properties of the ionic melts based on alkali metal chlorides at 600 °C strengthen in the following sequence CsCl-KCl-NaCl — KCl-LiCl — CaCl2-BaCl2-NaCl — CaCl2-NaCl. 

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Oxoacidity scales for melts based on alkali- and alkaline-earth metal halides 119... 

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