Dünnschicht-Chromatographie anorganischer Salze auf Silicagel

Reactions of aquo-, hydroxo- and acido-complexes with silica gel surfaces can be compared and illustrated by means of thin-layer chromatography. In the case of non-hydrolyzing cations (K⁺), these reactions are ion-exchange reactions, and in the case of hydrolyzing cations (Al³⁺), they are adsorption processes with hydroxo-complexes. Formation of acido-complexes with high stability suppresses cation hydrolysis in aqueous solutions and—in consequence—adsorption on silica gel surfaces. Chromatograms on silica gel therefore also illustrate reactions in solutions.