.
* Left photo: Balance two "empty"
clean Cola
cans on a scale. The
right one is closed by a sticky tape.
* Generate hydrogen from a piece of zinc
and 20 ml of hydrochloric acid (10%) in a 50-ml vial
closed by a stopper which
is punctured by a drinking straw.
* Take the right Cola can from the
scale and put its opening over the straw to replace the air
by hydrogen (H2).
* Right photo: The can with hydrogen
-closed by sticky tape- placed bottom up on the
right pan has lost weight:
1/3 g gram has to be added to the right pan to rebalance the loss of 330
ml air.
(The weight
of H2 may be neglected).
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last modification: 23.01.2001
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