Preparing gases and testing for them
You need to know how to collect gases produced in reactions by upward and downward delivery, over water and using a gas syringe. You need to be able to explain the method of collection if you are given information about the density and solubility of the gas concerned.
The table summarises the ways in which hydrogen, oxygen, carbon dioxide, ammonia and chlorine may be collected. Note that all these gases may be collected using a gas syringe.
|less dense than air?||yes||yes|
|denser than air?||slightly||yes||yes|
|solubility in water?||very low||low||low||very high||moderate|
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