Chemical and Electrochemical Behavior in Molten Alkali Hydroxides: III . Chemistry of Tin (II) and (IV) in the Eutectic Mixture and in Pure

Abstract

This paper describes the chemical behavior of tin (II) and (IV) in the eutectic mixture (49M%) at 483 K and in molten at 623 K. Sn(II) is unstable in molten hydroxides and is oxidized by the solvent. The oxidation of occurs either directly in the solid phase or after dissolution as . Basic conditions promote the liquid phase oxidation. Sn(IV) dissolves as in the eutectic mixture. Soluble in basic melts, it is only slightly soluble in acidic melts and precipitates as at water concentrations <4.10−2M and as a mixture of and in more acidic media. Sn(IV) is practically insoluble in acidic sodium hydroxide and precipitates as . It dissolves in basic melts as , being precipitated from saturated solutions.