Abstract
The acid NaPO3 has been potentiometrically titrated with the carbonates of Li, Na, K, Ca, Sr and Ba in molten KNO3 at 350°C. Both “forward” and “backward“ titration curves show marked potential inflexions at simple acid: oxide-ion donor ratios. The reaction products depend on the cation of the titrant, and in some cases on the route of the reaction. The P:O and P:e ratios of the compounds formed at the disappearance of PO3− (in forward experiments) or CO32− (in backward ones) are proposed to characterize the acid character of the cations. Acidity decreases in the succession Ca > Li > Sr > Ba > Na, K.
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