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 Collecting Gas.

Downward Delivery.

A gas which is more dense than air can be collected by downward delivery.
Examples of gases which 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 which is giving off the gas.

Collecting Gas using Downward Delivery

The more dense gas falls to the bottom of the gas jar and displaces the air.

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