Description of experiment
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Needed compounds:
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sulphuric acid : H2SO4
sodium metaperiodate : NaIO4
manganese (II) sulfate : MnSO4 . H2O
Class:
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elem=I,Mn
redox
Summary:
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Periodate is capable of oxidizing manganese (II) to permanganate completely
in a short period of time. This is one of the rare examples of an oxidizer,
which is capable to oxidize manganese all up to the +7 oxidation state in
aqueous environments.
Description:
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Dissolve some manganese sulfate in dilute sulphuric acid and add an excess
amount of solid NaIO4 to this liquid: The NaIO4 dissolves and the liquid
remains colorless.
Heat the liquid: Now, the color of the liquid slowly changes to deep purple.
At the elevated temperatures, the manganese is oxidized to permanganate. This
reaction takes several minutes, however, even at elevated temperatures.