Description of experiment
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Needed compounds:
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sodium cyanide : NaCN
hydrochloric acid : HCl
copper sulfate penta hydrate : CuSO4 . 5H2O
Class:
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elem=Cu,Cl
coordination
Summary:
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Copper (II) forms a yellow/brown coordination complex with cyanide in
acidic media in the presence of chloride.
Description:
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Add some copper sulfate to some hydrochlorid acid (7%): The solid dissolves
and the liquid becomes green.
Add some solid NaCN: The solid dissolves. Around the flakes of NaCN, the liquid
becomes fairly dark brown. When the liquid is shaken and all NaCN is dissolved,
then the liquid is brown/yellow and clear.