Description of experiment
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Needed compounds:
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ammonium thiocyanate : NH4SCN
methanol : CH3OH
cobalt sulfate : CoSO4.7H2O
Class:
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elem=Co
coordination
Summary:
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Cobalt sulfate dissolves in methanol, albeit not as well as in water. The
liquid obtained is colored quite intensely. The dilute solution of cobalt
sulfate in methanol looks more pink/purple than even the most concentrated
aqueous solution.
With thiocyanate a deep blue complex is formed in methanol.
Description:
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Add some solid CoSO4.7H2O to methanol: Only a small part of the solid
dissolves. The liquid becomes fairly intense pink/purple.
Add some solid NH4SCN: The solid dissolves, the liquid becomes deep blue and
a deep blue precipitate is formed.
Make the volume trice as large by adding water: The liquid still is deep blue,
it becomes somewhat more clear.
Add even more water: The liquid becomes pink and remains slightly turbid.