Description of experiment
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Needed compounds:
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sodium metabisulfite : Na2S2O5
ferric chloride : FeCl3 . 6H2O
potassium ferricyanide : K3 [Fe(CN)6]
Class:
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elem=Fe
coordination
redox
Summary:
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Iron (III) compounds with hexacyanoferrate (III) can be reduced easily.
Description:
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Dissolve some K3[Fe(CN)6] in water: The solution is yellow.
Dissolve some FeCl3.6H20 in water: The solution is brown/yellow and is
slightly opaque.
Mix the two liquids: The resulting liquid is dark brown. The resulting
liquid remains clear, no formation of a precipitate.
Add a solution of sodium metabisulfite (Na2S2O5): The solution turns
intensely deep blue. A dark blue precipitate is formed. There is a pungent
odour of SO2.
Dilute the dark blue liquid aproximately 10 times: The resulting liquid
still has an intense deep blue color. There still is a faint odour of
SO2.