chemistry precipitate colours Flashcards
how do you test for ammonium NH4+?
add sodium hydroxide, warm test with red litmus paper
what is the result of testing ammonium NH4+?
the damp red litmus paper should turn blue
how do you test copper (II) Cu2+?
add sodium hydroxide
what should be the result of testing copper (II)?
it should result in a light blue precipitate
how do you test for iron (II)?
add sodium hydroxide
what is the result of testing for iron (II)?
a green precipitate should be formed
how do you test for iron (III)?
add sodium hydroxide
what is the result of testing for iron (III)?
a red/brown precipitate should be formed
how do you test for aluminium ?
by adding sodium hydroxide
what colour of precipitate does aluminium turn when tested for?
white
what colour does lithium turn a flame?
red
what colour does potassium turn a flame?
lilac
what colour does sodium turn a flame?
yellow
what colour does copper turn a flame?
blue/green
what colour does calcium turn a flame?
orange/red
how do you test for a chloride?
add nitric acid then add silver nitrate
what colour precipitate does choride result in?
white precipitate
how do you test for bromide?
add nitric acid then add silver nitrate
what coloured precipitate does bromide result in when tested for?
cream
how do you test for iodide?
add nitric acid then add silver nitrate
what coloured precipitate does iodide result in when tested for?
yellow
how do you test for sulfate?
by adding barium chloride
what coloured precipitate does sulfate produce when tested for?
white
how do you test for carbonate
add acid bubble gas through lime water
how do you know if carbonate is present when tested for?
bubbles, limewater turns cloudy
