Description of experiment
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Needed compounds:
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hydrogen peroxide : H2O2
sulphuric acid : H2SO4
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 stable towards dilute sulphuric acid.
Addition of hydrogen peroxide also does not destroy the yellow complex.
Description:
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Add some solid cobalt yellow to a mix of dilute sulphuric acid and hydrogen
peroxide, which contains appr. 1 M H2SO4 and 5% H2O2 by weight: No visible
changes besides the bubbling, due to decomposition of H2O2. The liquid remains
turbid and yellow.