How is a Gas Collected Over Water?
A gas that is not soluble (or only
slightly soluble) in water
can be collected over
water.
Examples of gases that can be
collected by this method
are hydrogen and oxygen.
A tube from the flask that is giving
off the gas is placed
under water.
A test tube full of water is
placed upside down
above the end of the tube to
collect the gas.
As the gas bubbles into the test
tube
it displaces the water until the test
tube is full.
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