Description of experiment
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Needed compounds:
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sodium metaperiodate : NaIO4
sodium iodide : NaI
Class:
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elem=I
redox
Summary:
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Iodide ion and metaperiodate react with formation of iodine. This reaction
occurs, even in the absence of an acid.
Description:
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Mix some NaIO4 and NaI and add a few drops of water: The liquid/slurry becomes
deep brown/red.
Heat the liquid: The water boils away. Remarkably, hardly any iodine vapors are
produced. These apparently are kept behind in the liquid, because of the
absence of acid. The air above the heaviliy boiling small slurry only is very
pale purple, almost colorless.