Description of experiment
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Needed compounds:
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ammonium thiocyanate : NH4SCN
cobalt chloride : CoCl2.6H2O
Class:
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elem=Co
coordination
Summary:
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Cobalt builds complexes with thiocyanate, although not very clearly.
Description:
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Add a solution of CoCl2.6H2O to a solution of NH4SCN: The resulting liquid
remains pink, but its color is more intense than that of the original
solution. The opposite would be the case if no reaction occurred (dilution
of Co2+ ions). The liquid remains clear.
Remark: The formation of a coordination complex is the most suitable
explanation of the intensifying of the color of the solution on addition
of thiocyanate.