Description of experiment
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Needed compounds:
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sodium metabisulfite : Na2S2O5
potassium ferricyanide : K3 [Fe(CN)6]
ferrous sulfate : FeSO4 . 7H2O
Class:
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elem=Fe
precipitation
coordination
Summary:
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Prussian blue cannot easily be reduced by acidic sulfite.
Description:
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Add a solution of ferrous sulfate and potassium hexacyanoferrate (III)
to each other: The resulting liquid becomes intensely colored, deep blue.
A dark blue precipitate appears.
Add an excess amount of sodium metabisulfite: The solid dissolves. The
liquid does not change noticably.