Oxo-acidity in ionic melts

The current state of research into the oxo-acidity in alkali metal nitrate, sulfate, and halide melts is analysed on the basis of the proposed classification of oxo-acidity reactions (Lux–Flood acid–base interactions). It is established that a considerable proportion of literature data on homogeneous acid–base equilibria are incorrect, since no account is taken in them of either the levelling of the acid (basic) properties by the solvent or of the error in the determination of the reaction stoichiometries. An explanation is proposed for the considerable scatter of data on the solubilities of oxides in ionic melts, which has been the principal inhibiting factor in the development of this field. The reactions of melts with gaseous acid and basic reagents are examined. The bibliography includes 171 references.