Description of experiment
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Needed compounds:
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potassium ferricyanide : K3 [Fe(CN)6]
sodium sulfite : Na2SO3
sodium hydroxide : NaOH
hydroquinone : HO C6H4 OH
Class:
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elem=C,Fe
redox
Summary:
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Hydroquinone is readily oxidized by ferricyanide, even in the presence of
sulfite, when in alkaline environments.
Description:
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Dissolve some hydroquinone in a liquid, containing both sodium hydroxide and
sodium sulfite: The liquid becomes pale yellow.
Add some very dilute (pale yellow) solution of potassium ferricyanide: The
liquid turns light orange and becomes noticably more intensely colored.