Chemistry 4.6 Flashcards
Test for hydrogen
Lit split produces a squeaky pop
Test for oxygen
Relights a glowing splint
Test for carbon dioxide
Bubble gas through limewater, turns cloudy
Test for chlorine
Bleaches damp blue litmus paper white
Describe the flame test
Dip wire loop in HCl and place in roaring flame until no more colour is observed
Dip wire loop in sample and then into roaring flame.
Observe colour
Flame test result for Lithium (Li+)
Red flame
Flame test result for Sodium (Na+)
Yellow flame
Flame test result for Potassium (K+)
Lilac flame
Flame test result for Calcium (Ca2+)
Orange-red flame
Flame test result for Copper (Cu2+)
Blue-green flame
Test for Iron (II) Fe2+
Add NaOH. Green precipitate forms
Test for Iron (III) Fe3+
Add NaOH. Orange-brown precipitate forms
Test for Copper (Cu2+)
not flame test
Add NaOH. Blue precipitate forms
Test for ammonia
Turns damp red litmus paper blue
Test for NH4+ (Ammonium)
Add NaOH (and warm). Ammonia gas is produced which turns damp red litmus paper blue.
