Notes on the Preparation and Analysis of Ruthenium(III) and Ruthenium(IV) in Sulfate Medium
Abstract
For equilibrium studies, pure solutions of ruthenium(III) and ruthenium(IV) perchlorates or sulfates are needed. A survey is given of synthetic and analytical methods reported in literature. Since none of them was suitable for our purpose, new or modified methods were worked out. For the preparation of ruthenium(IV) sulfate solution, RuO4 was reduced with H2O2 in dilute H2SO4 and the ruthenium(IV) cations separated from complex anions by a cation exchanger. For the preparation of ruthenium(III), RuO4 was reduced with SO2, the excess SO2 removed and the sulfite complex decompressed. Total ruthenium was determined by reducing to metallic ruthenium, using Mg metal, and then weighing. For determining ruthenium(III) or ruthenium(IV), a redox titration method is proposed: a known excess of cerium(IV) sulfate in ~2 M H2SO4 is added, the RuO4 formed is boiled off and the remaining cerium(IV) backtitrated with iron(II) + ferroin. For the determination of H, the total analytical concentration of H+, in purely cationic Ru(IV) solutions, the ruthenium may be either held back in a H+ -saturated ion exchanger or bound by adding acetylacetone. The H+ set free can be in both cases be titrated with standard NaOH. Concordant results were obtained using these two methods.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1960
- Accession Number
- AD0245503
Entities
People
- Felipe Brito
Organizations
- Royal Institute of Technology