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Collecting Gas.

Over Water.

A gas which is not soluble (or only slightly soluble) in water
can be collected over water.
Examples of gases which can be collected by this method
are hydrogen and oxygen.

A tube from the flask which 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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