Description of experiment
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Needed compounds:
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hydrochloric acid : HCl
zinc oxide : ZnO
potassium ferricyanide : K3 [Fe(CN)6]
potassium ferrocyanide : K4 [Fe(CN)6] . 3H2O
Class:
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elem=Fe,Zn
precipitation
Summary:
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Both ferrocyanide and ferricyanide react with zinc salts, yielding
completely differently colored solid compounds.
Description:
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Dissolve some zinc oxide in an excess amount of HCl (appr. 10% by weight):
The liquid becomes clear and colorless. This solution is called solution Z.
Add a solution of potassium ferrocyanide to solution Z: Formation of a
white precipitate.
Add a solution of potassium ferricyanide to solution Z: Formation of a
yellow/orange precipitate.