collecting and drying gases Flashcards
what is the displacement of water used to collect?
insoluble/slightly soluble gases e.g. H2,O2.CO2
what is downward delivery used to collect?
gases that are denser than air Mr>29
what is calcium oxide/quicklime used to dry?
ammonia (NH3)
what is upward delivery used to collect?
gases that are less dense than air Mr<29
what is fused calcium chloride used to dry?
Nitrogen (N2), Hydrogen (H2), Oxygen (O2) only
what is sulfuric acid used to dry?
hydrogen chloride (HCL), Chlorine (Cl2), carbon dioxide (CO2) only
why can’t acids be used to dry ammonia?
They will react
what experimental technique is used to collect carbon dioxide?
displacement of water
what experimental technique is used to collect chlorine?
downward delivery
what experimental technique is used to collect nitrogen?
upward delivery
what is used to dry oxygen?
fused calcium chloride
what is used to dry hydrogen chloride?
concentrated sulfuric acid
what is used to dry ammonia?
calcium oxide/quicklime
