A study of chemical reactions in molten sodium-potassium hydrogen sulfate eutectic. III. The reactions of anions

Abstract

The reactions of 11 inorganic anions added as their sodium or potassium salts to molten sodium-potassium hydrogen sulfate eutectic were studied and their stoichiometries elucidated. It was found that Na₂CO₃, NaNO₂, KNO₃, Na₂SO₃ and Na₂S₂O₃ reacted with the melt to form water and CO₂, NO+NO₂, NO₂+O₂, SO₂, S₆+SO₂ respectively. NaCl, KBr produced HCl and HBr while KI reaction products consisted of I₂, SO₂ and H₂O; K₂CrO₄ and K₂Cr₂O₇ were converted into H₂CrO₄ and H₂Cr₂O₇ respectively. These acids decomposed to H₂O, O₂ and Cr₂O₃ which reacted further with the melt to produce H₂O and Cr₂(SO₄)₂,H₂O. K₂S₂O₈ was found to decompose thermally to O₂ and K₂S₂O₇ without reacting with the melt.