Description of experiment
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Needed compounds:
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dimethyl sulfoxide : (CH3)2SO
chromium (III) chloride hexahydrate : CrCl3.6H2O
Class:
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elem=C,Cr
precipitation
coordination
Summary:
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Chromium (III) chloride dissolves in DMSO to quite some extent. A precipitate
is formed slowly. Is this a DMSO complex?
Description:
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Add some solid dark green chromium (III) chloride hexahydrate to DMSO: The
solid dissolves and the liquid becomes beautifully green, just as the solution
in water.
Let stand for half an hour: A solid has formed, the liquid has become turbid
and a precipitate has settled at the bottom.
Add a lot of water and shake: The liquid mixes with the water, the solid
dissolves. A clear and green solution is obtained.