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One of the following apparati should be built: a 500-mL Erlenmeyer flask with a two-hole stopper to which a dropping funnel and a glass delivery tube have been attached, or a 500-mL filter flask fitted with a one-hole stopper and a dropping funnel.
Collection should take place via the downward displacement of water (if the gas doesn't react with water) or the downward or upward displacement of air (depending on the relative density of the gas). Gas should be collected in a balloon to be easily accessible in a lecture demonstration (see 4.1 video and 4.2 demonstration sheet and video).
The following gases can be produced by the methods provided: