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A Comproportionation - even synproportionation called - is the opposite of disproportionation . Both are special cases of a redox reaction . In the case of comproportionation, simultaneous reduction and oxidation from a higher and a lower oxidation state of two atoms of the same element form an intermediate oxidation state.


One example is the reaction of iodine atometry , in which iodate is reduced in acidic solution and iodide is oxidized at the same time . The product contains iodine in the ± 0 oxidation state. The Roman numerals above the reaction equation indicate the formal oxidation numbers.

Iodate and iodide react in acidic solution to form iodine and water ( endothermic ).

Another example is the following:

Sulfuric acid and hydrogen sulfide react to form sulfur and water ( exothermic ).

Individual evidence

  1. Entry on comproportioning. In: Römpp Online . Georg Thieme Verlag, accessed on June 9, 2012.
  2. Entry on Comproportionation . In: IUPAC Compendium of Chemical Terminology (the “Gold Book”) . doi : 10.1351 / goldbook.C01217 Version: 2.1.5.