Description of experiment
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Needed compounds:
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cobalt sulfate : CoSO4.7H2O
sodium silicate : Na2SiO3
Class:
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elem=Co,Si
precipitation
Summary:
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Cobalt (II) gives a deep blue precipitate with silicates.
Description:
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Add a dilute solution of sodium silicate (dilute water glass) to a solution
of cobalt sulfate: A deep blue (dark, but very bright color) precipitate
is formed. This precipitate is a cobalt (II) silicate of indeterminate
composition.