Gas
|
Test
|
Results
|
I)
hydrogen (H2)
|
introduce lighted
splint
|
explodes with squeaky pop
|
I i) oxygen (O2)
|
introduce glowing splint
|
reignites the splint
|
I ii)
carbon dioxide (CO2)
|
bubble through lime water
|
goes
milky white*
|
I v) ammonia (NH3)
|
introduce moist red litmus paper
|
turns
blue
|
V ) chlorine (Cl2)
|
introduce moist indicator paper
(any colour)
|
indicator paper is bleached
white
|
Note: The
limewater goes milky because a white precipitate of insoluble calcium carbonate
is formed. The equation for limewater (calcium hydroxide) reacting with carbon
dioxide is:
Ca(OH)2(aq) + CO2(g) →
CaCO3(s) + H2O(l)
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