Please enable JavaScript.
Coggle requires JavaScript to display documents.
science flame and gas test - Coggle Diagram
science flame and gas test
flame
lithium Li
crimson
sodium Na
yellow
potassium K
lilac
calcium Ca
orange-red
copper Cu
green
process
dip wire in acid to clean
dip wire into compound
put wire in outer flame
note the colour
Metal ion
iron ll
green
iron lll
orange-brown
copper
blue
calcium
white
zinc
white
Gas
lighted splint held in tube
pop sound heard
hydrogen present
gas bubbled through lime water
limewater goes cloudy
carbon dioxide is present
damp litmus paper held in tube
paper turns white
chlorine is present
glowing splint held in tube
splint relights
oxygen is present
sodium hydroxide test NaOH
white precipitate
aluminium
add more sodium hydroxide
dissolves
calcium
flame test
orange-red
magnesium
flame test
no colour produced
coloured precipitate
blue
copper ll
green
iron ll
brown
iron lll
testing for negative ions
carbonates
add dilute hydrochloric acid
if it fizzes test for carbon dioxide
bubble gas through limewater
should go cloudy if carbon dioxide is present
halides
1.add dilute nitric acid then silver nitrate
will form coloured precipitate , unique
chloride = white
bromide = cream
iodine = yellow
sulfates
add dilute hydrochloric acid and barium chloride
if sulfate present
white precipitate
copper sulfate