Tests for ions and gases Flashcards
effect of adding aqueous sodium hydroxide to ammonium
when heated, ammonia gas given off- turns litmus blue
effect of adding aqueous sodium hydroxide copper
Pale blue precipitate forms and precipitate does not dissolve in excess
effect of adding aqueous sodium hydroxide to iron (II)
Pale green precipitate forms and precipitate does not dissolve in excess
effect of adding aqueous sodium hydroxide to iron (III)
Red-brown precipitate forms and precipitate does not dissolve in excess
effect of adding aqueous sodium hydroxide to aluminium
white precipitate forms and precipitate does dissolve in excess sodium hydroxide
effect of adding aqueous sodium hydroxide to zinc
white precipitate forms and precipitate does dissolve in excess
effect of adding aqueous sodium hydroxide to calcium
white precipitate forms and precipitate does not dissolve in excess
effect of adding aqueous sodium hydroxide to chromium
green precipitate and precipitate does dissolve in excess
effect of adding aqueous ammonia to copper
pale blue precipitate forms and adding excess the ppt dissolves- deep blue solution
effect of adding aqueous ammonia to iron (II)
pale green precipitate forms and ppt does not dissolve in excess
effect of adding aqueous ammonia to iron (III)
Red-brown precipitate forms and precipitate does not dissolve in excess
effect of adding aqueous ammonia to aluminium
white precipitate forms and precipitate does not dissolve in excess
effect of adding aqueous ammonia to zinc
white precipitate forms and precipitate does dissolve in excess
effect of adding aqueous ammonia to calcium
no precipitate forms (or slight)
effect of adding aqueous ammonia to chromium (III)
grey green precipitate and insoluble in excess
what are the tests for the metal ions
the flame test
flame test of lithium
red
sodium
yellow
potassium
lilac
copper
blue-green
calcium
orange- red
barium
light green
which are the 3 halides
chloride, bromide and iodide
how do you test for the halides
add nitric acid then silver nitrate solution
what would the result be for chloride
white precipitate
what would the result be for bromide
cream precipitate
what would the result be for iodide
yellow precipitate
how to test for nitrate
add aluminium foil and sodium hydroxide solution and heat
what would the result be for nitrate
ammonia gas given off
how to test for sulfate
add hydrochloric acid then barium nitrate solution
what would the result be for nitrate
white precipitate
how to test for sulfite
add hydrochloric acid and warm gently
what would the result be for sulfite
sulfur dioxide produced
how to test for carbonate
add hydrochloric acid
what would the result be for carbonate
bubble seen, lime water turns milky
how to test for oxygen
put a glowing splint to the test tube
what would the result be for oxygen
splint relights
how to test for hydrogen
put a lighted splint to the test tube
what would the result be for hydrogen
goes ‘pop’
how to test for carbon dioxide
bubble through lime water (aqueous calcium hydroxide)
how to test for ammonia
hold damp red litmus at mouth of the test tube
what would the result be for carbon dioxide
turns milky (cloudy)
what would the result be for ammonia
litmus paper turns blue and has a pungent smell
how to test for chlorine
hold damp blue litmus at mouth of test tube
what would the result for chlorine
turns damp litmus red then white
how to test for sulfur dioxide
add acidified potassium permanganate
what would the result be for sulfur dioxide
turns from purple to colourless
what colour are group 1 metals
white solids and dissolve in water to form colourless solutions
what colur is chlorine
pale green-yellow
what colour is bromine
red-brown
what colour is iodine
grey-black and sublimes into purple vapour
what colour is fluorine
pale yellow
what colour are noble gases
colourless