Über Isopolywolframatfeststoffe und deren Beziehung zu Isopolywolframationen in wäßriger Lösun / Concerning Solid Isopolytungstates and their Relation to Isopolytungstate Ions in Aqueous Solutio

Abstract

A classification and characterization of the solid isopolytungstates obtainable from acidified aqueous solutions is given and the relation of the solid isopolytungstates to the isopolytungstate ions in the corresponding solutions is studied. As distinguished from the molybdate system all the polytungstate ions forming a solid exist in solution as well. The reasons for the non-occurrence of insoluble solids of species absent from solution are discussed. For setting up a reaction scheme on the polytungstates only very few of the large number of papers on this subject give evidentiary informations.