Description of experiment
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Needed compounds:
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ethylene diamine : NH2 CH2 CH2 NH2
copper sulfate anhydrous : CuSO4
Class:
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elem=N,Cu
coordination
Summary:
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When ethylene diamine is added to anhydrous copper sulfate, then no complex is
formed. When a little water is added, then suddenly a deep blue/purple complex
is formed. Apparently, some water is needed for formation of the ethylene
diamine complex.
Description:
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Add half a ml of ethylene diamine to a small amount of anhydrous copper
sulfate: Hardly any reaction occurs. The solid changes from white to pale blue
with a green hue. No solid seems to dissolve.
Add one ml of water: The liquid at once turns deep purple/blue, a complex of
copper(II) with ethylene diamine is formed. The anhydrous copper sulfate
quickly dissolves and the final result is a liquid with a very intense color.