The behaviour of several oxoanions dissolved in molten alkali-metal nitrates

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Abstract
The behaviour of several oxoanions (HSO4-, HSO3-, NO2-, ClO4-, ClO3-, SO42-, SO32-) dissolved in a molten NaNO3-KNO3 eutectic at 300�C was studied by means of an oxygen electrode. NaHSO4 and NaHSO3 were found to decompose very rapidly to form S2O72- or S2O52-, and water. NO2-, SO42-, and SO32- were found to dissociate to a measurable extent to form O2- and the equilibrium constants were determined for these dissociations. SO42- and SO32- appear to dissociate according to the equations SO42- ←→ SO3 + O2 And SO32- ←→ SO2 + O2 in which SO3 and SO2 remain solvated in the melt under the conditions used. ClO4- was found to be completely stable in the melt, but ClO3- appears to form an adduct with O2-. Tentatively assuming that the reaction is ClO3- + O2-←→ ClO43- we have found the equilibrium constant to be 3.57 x 103.

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