Description of experiment
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Needed compounds:
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ammonia : NH3
potassium ferrocyanide : K4 [Fe(CN)6] . 3H2O
copper sulfate penta hydrate : CuSO4 . 5H2O
Class:
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elem=Cu,Fe
coordination
precipitation
Summary:
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Copper (II) reacts with ferrocyanide and builds a fairly stable compound.
Description:
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Add a solution of CuSO4.5H2O to a solution of K4[Fe(CN)6].3H2O (excess
amount of potassium ferrocyanide): Formation of a purplish brown precipitate,
which looks like a little sponge. When handled carefully it can be kept as
one piece.
Add a large amount of ammonia (15% by weight): The liquid turns dark blue,
but not all of the precipitate dissolves.