Description of experiment
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Needed compounds:
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sulphuric acid : H2SO4
acetone : CH3 CO CH3
cupric chloride dihydrate : CuCl2 . 2H2O
Class:
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elem=Cu,Cl
coordination
Summary:
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Cupric chloride dihydrate dissolves in acetone. The solution becomes yellow
at low concentrations, green/brown at higher concentrations. When sulphuric
acid is added, then a precipitate of anhydrous cupric chloride is formed.
Description:
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Add some solid CuCl2.2H2O to some acetone: The solid partly dissolves. The
liquid becomes yellow and when more of the solid dissolves, then the liquid
becomes green/brown. Where the acetone evaporates, a brown solid remains.
The glass becomes covered with some brown/yellow crust, when the acetone
evaporates. The liquid itself remains clear all the time.
Add a few drops of concentrated H2SO4 (96%): A brown precipitate is formed.
The temperature of the liquid raises (when acetone and H2SO4 combine, then
a fairly large amount of heat is generated).
Add a lot of water and shake well: The liquid becomes clear and light blue.
All remaining solid cupric chloride now dissolves.