Description of experiment
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Needed compounds:
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hydrochloric acid : HCl
hydroxyl amine sulfate : (NH3OH)2 SO4
sodium hydroxide : NaOH
copper sulfate penta hydrate : CuSO4 . 5H2O
Class:
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elem=Cu,N
redox
Summary:
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Copper (II) is reduced by hydroxyl amine very quickly in alkaline
environments. Yellow copper (I) hydroxide/oxide is formed.
Description:
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Add a solution of copper sulfate to a solution of hydroxyl amine sulfate in
a solution of excess sodium hydroxide: Formation of a dark green/brown
precipitate, which quickly becomes yellow/ochre/brown. The copper (II)
compound is reduced to a copper (I) compound.
Add an excess amount of HCl (appr. 10% by weight): Liquid becomes milky white
for a while and then it becomes completely clear and colorless.