Ways of Collecting Gases
- A gas syringe can be used to collect nearly any gas
- A side-arm flask can be used too. It can be connected to a delivery tube to bubble gas into an upside-down measuring cylinder or a gas jar filled with water. This method only works for insoluble gases. It can't be used for collecting hydrogen, chlorine and ammonia as they dissolve in water.
Upward and Downward delivery
- Upward delivery is used if the gas you want to collect is lighter than air e.g. hydrogen.
- Downward delivery is used if the gas you want to collect is heavier than air e.g. carbon dioxide, chlorine.
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