Description of experiment
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Needed compounds:
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sodium sulfite : Na2SO3
hydrochloric acid : HCl
ferric chloride : FeCl3 . 6H2O
Class:
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elem=Fe,S
coordination
Summary:
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Ferric ions form a coordination complex with sulfite.
Description:
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Add a slightly acidified solution of ferric chloride to a solution of
sodium sulfite: The liquid becomes turbid for a moment, but after the
initial transient it turns clear again. The liquid becomes intense red/brown.
A coordination complex is formed between ferric ions and sulfite.