G) Chemical tests
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19 Terms
how to test for hydrogen
squeaky pop with lit splint
how to test for oxygen
relights a glowing splint
how to test for carbon dioxide
bubble through limewater
colourless —> cloudy
how to test for ammonia
add sodium hydroxide
will turn moist litmus paper from red to blue, and moist universal indicator paper to blue
how to test for chlorine gas
damp blue litmus paper will turn to red and then to white
test for Lithium
Li+
red flame test
flame test for Sodium
Na+
yellow
test for potassium
K+
flame = lilac
test for calcium ions
Ca2+
flame test = orange-red
test for copper
Cu2+
flame test = blue-green
how to test for iron (II)
Fe2+
add sodium hydroxide = green precipitate
how to test for iron (III) ions
Add sodium hydroxide = brown precipitate
how to test for copper (II) (using NaOH)
Cu2+
add sodium hydroxide = blue precipitate
test for ammonium
NH4+
add sodium hydroxide solution
Gas → red litmus blue
how to test for sulfate ions
add HCl to remove any impurities
add BaCl2 solution → if present, a white precipitate will form
how to test for carbonate ions
add hydrochloric acid , if carbonate ions are present, fizzing will occur
carbon dioxide is evolved (test using limewater)
how to test for chloride ions
add nitric acid to remove any impurities
add silver nitrate, if chloride ions are present they will produce a white precipitate
how to test for bromide ions
add nitric acid to remove any impurities
add silver nitrate, if present they will produce a cream precipitate
how to test for iodide ions
add nitric acid to remove any impurities
add silver nitrate solution, if iodide ions are present they will produce a yellow precipitate
