Experiments for 'potassium hexa nitrito cobaltate (III)'
Below follows a summary of all experiments, matching your search. Click one of the EXPERIMENT hyperlinks for a complete description of the experiment.
Results for 'potassium hexa nitrito cobaltate (III)':
EXPERIMENT 1
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Cobalt yellow contains the hexanitrito cobaltate (III) complex ion. This
ion is remarkably stable, when it is locked up in the insoluble potassium
salt. With concentrated hydrochloric acid, however, the complex ion is
broken down slowly.
EXPERIMENT 2
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The hexanitrito cobaltate (III) ion can be reduced by SO2 to cobalt (II),
but this reduction requires heating. Some brown compound remains, this
probably is due to the inertness of many cobalt (III) coordination
complexes. With nitrite, a brown complex is formed again. This differs
from the gold/yellow hexanitrito cobaltate (III).
EXPERIMENT 3
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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?
EXPERIMENT 4
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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.
EXPERIMENT 5
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The hexanitrite cobaltate (III) ion is strongly affected by sulfide. A black
compound is formed. On acidification of this, remarkably, no hydrogen
sulfide is formed. Probably the black compound is a compound containing
sulfide and nitrite in a single compound, which on acidification results
in oxidation of the sulfide.
EXPERIMENT 6
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The yellow pigment aureolin, also known as cobalt yellow, and having the
chemical name potassium hexanitrito cobaltate(III), can be used as a mild
oxidizer which gives a very smoothly and evenly burning mix with red
phosphorus. When also aluminium powder is added to the mix, then the reaction
is more violent and sparks are sprayed around.
End of results for 'potassium hexa nitrito cobaltate (III)'