Experiments for 'cobalt chloride'
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 'cobalt chloride':
EXPERIMENT 1
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Cobalt builds complexes with thiocyanate, although not very clearly.
EXPERIMENT 2
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Cobalt salts give a nicely colored precipitate with ferrocyanide.
EXPERIMENT 3
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Cobalt builds highly colored complexes with thiocyanate when acetone
is added. This complex is soluble in ether.
EXPERIMENT 4
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Cobalt (II) builds complexes with nitrogen oxides.
EXPERIMENT 5
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Cobalt (II) appears to react with ammonia, but only when an oxidizer
is available. The resulting compound has an intense color.
EXPERIMENT 6
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Cobalt (II) forms a coordination complex with nitrous oxide, which easily
decomposes again. On addition of alkali, the cobalt is oxidized and appears
to build a cobalt-compound of an higher oxidation state.
EXPERIMENT 7
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Cobalt gives a green coordination complex with tartrates, when oxidized to
the +3 state.
EXPERIMENT 8
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Cobalt (II) gives a coordination complex with catechol (or is this due
to formation of a cobalt (III) complex with catechol????).
EXPERIMENT 9
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Cobalt (II) gives a blue precipitate with hydroxide, but this precipitate
quickly turns pink / purple / light brown after its formation.
EXPERIMENT 10
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Cobalt (II) salts give a blue/green precipitate when dilute ammonia is added.
This precpitate is fairly stable towards air. When more concentrated ammonia
is used, then a dark brown compound is formed, but this compound is formed
by contact with air. On addition of hydrogen peroxide also a very dark
brown compound is formed.
When the pH is increased strongly, then the blue precipitate is not stable
anymore, instead a dark bright blue compound is formed, which, however,
quickly turns pink.
When a large amount of ammonia is replaced by ammonium, then the blue
precipitate is not formed anymore, but a coordination complex is formed,
which is very easily oxidized by oxygen from the air.
EXPERIMENT 11
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Cobalt (II) chloride hexahydrate is a red/purple compound. When it is heated,
it becomes blue, first dark blue, lateron much lighter blue. The latter
compound is anhydrous cobalt (II) chloride.
Anhydrous cobalt (II) chloride dissolves with a deep blue color in DMSO. With
nitrite, apparently no complex (or a complex with the same color) is formed,
the solution remains deep blue.
The anhydrous cobalt (II) chloride also dissolves in water without problems.
Such solutions are pink. With nitrite these form yellow complexes on
acidification.
Anhydrous cobalt (II) chloride is not soluble in nitromethane.
EXPERIMENT 12
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Cobalt chloride, both the anhydrous form and the hydrated form (with 6 H2O)
dissolve in acetone, giving a deep blue/cyan solution. When an apolar solvent
is added to this (e.g. ligroin), then the solution of anhydrous cobalt chloride
gives a fine light blue precipitate, the solution of the hydrated cobalt
chloride gives small droplets of deep cyan/blue solution, with a colorless
liquid above it.
End of results for 'cobalt chloride'