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Experiment 8:
How
sodium chloride is made from a sodium metal and chlorine
Left
A modified Obendrauf chlorine gas generator:
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A micro spatula of potassium permanganate is on the bottom of a wide
5-ml-DIN injection vial (Heparin Braun).
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Its stopper is pierced by a 10-ml syringe the plunger of which was removed.
Activated charcoal is inside to absorb chlorine.
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The stopper is also punctured by a 2-ml syringe containing concentrated
HCl.
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As soon as HCl(aq) drops on KMnO4 chlorine gas emanates replacing
the air.
*
After that the charcoal syringe is replaced by a 5-ml syringe to collect
pure chlorine gas.
(Finally this syringe is again replaced by the syringe for the absorption).
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Middle: A sodium piece half the size of a
match head is activated in a high 5-ml-DIN injection vial (Heparin
Roche)
using a micro spirit burner. 5 ml chlorine is blown on the molten sodium.
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In a vigorous reaction sodium metal and chlorine gas react to form a new
substance:
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(Rechts)
It is white and brittle. So it can be grinded to form a white powder: Sodium
chloride.