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Collecting Gas

How is a Gas Collected using Downward Delivery?

A gas that is more dense than air can be collected
by downward delivery.
Examples of gases that can be collected by this method are
carbon dioxide, chlorine, hydrogen chloride and sulfur dioxide.

A gas jar is connected by a tube to the flask that
is giving off the gas as shown in the picture below.

Collecting Gas using Downward Delivery

The gas that is more dense than air falls to the bottom
of the gas jar. The air in the gas jar is
displaced until the gas jar is filled with the collected gas.

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