Description of experiment
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Needed compounds:
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hydrogen peroxide : H2O2
nitric acid : HNO3
potassium hexa nitrito cobaltate (III) : K3 [Co(NO2)6] . H2O
Class:
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elem=Co
redox
Summary:
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The hexanitrito cobaltate (III) ion is affected by concentrated nitric
acid. It changes from yellow to brown. What is the nature of this change?
Description:
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Add some solid cobalt yellow to HNO3 (appr. 50% by weight): The yellow
compound becomes brown/ochre. The liquid remains turbid.
Add somehydrogen peroxide (10% H2O2 by weight): The liquid starts foaming,
no further changes.