Please enable JavaScript.
Coggle requires JavaScript to display documents.
unknown cations, unknown anion - Coggle Diagram
unknown cations
sodium hydroxide
few drops
white precipitate
on adding excess
dissolve in excess NaOH to form a colourless solution
Zn 2+
Al 3+
insoluble
Ca2+
light blue precipitate
Cu2+
green precipitate
Fe2+
red brown precipitate
Fe3+
no precipitate formed
heating
colourless & pungent gas produced that turns moist red litmus paper blue
NH4 +
Ammonia
few drops
red-brown precipitate
Fe 3+
green precipitate
Fe 2+
no precipitate
Ca 2+
white precipitate
add excess ammonia
white precipitate insoluble in excess ammona
Al3+
dissolves to form colourless solution
Zn 2+
unknown anion
acidify with dilute nitric acid, add silver nitrate
white ppt
chloride ions
yellow ppt
iodide ion
acidify with dilute nitric acid, add barium nitrate
no ppt
no sulfate ion
white ppt
has sulfate ion
add sodium hydroxide
colourless and pungent gas evolved turns moist red litmus paper blue.
NO3 -
add dilute hydrochloric acid. bubble gas into limewater
white ppt
carbonate ion