Microscale Chemistry Experimentation for Teachers
2. Generating
and collecting nitrogen dioxide
using two vials and one nozzled closure
*
Left: In
a 5-ml vial drops of concentrated nitric acid are added to a small piece
of copper wire.
* The vial is closed
by a stopper containing a nozzle made of a short drinking straw.
* A second vial
is placed bottom-up on the stopper of the first vial.
* To accelerate
the chemical reaction a third vial is used as micro
spirit burner.
*
Right:
A plastic pipette tip is another useful nozzle.
Due to its
conical shape it can be easily connected to tubings of different diameters.
Vial as a safe micro spirit burner
Improvement of the method by a powerpoint
presentation