Notes on the Preparation and Analysis of Halogenide-Free Rhodium(III) Perchlorate (Sulfate) Solutions

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Abstract:

A method is described for the preparation of halogenide-free rhodiumIII perchlorate sulfate solutions. As starting material, rhodium chloride or rhodium bromide can be used. The halogenide was removed by means of ozone, which oxidizes free not complex-bound halogenide to halogen and RhIII to RHV O3 2X- 2H yields RhV O2 H2O 1 X Cl or Br RhIII O3 2H yields RhV O2 H2O 2. The RhV produced, being a strong oxidizing agent, also reacts with the halogenide according to RhV 2X- yields RhIII X2 3. Methods for the detection of halogenide-ions in rhodium solutions are given.

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