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Chemical tests - Coggle Diagram
Chemical tests
gas test
oxygen
A splint (burnt) and held over the test tube , if oxygen is present, the splint is relit
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Water test
Presence of water : add hydrate anhydrous copper sulfate ,it will turn blue from white
Purity : Boil the water and check the boiling point, the abnormal temperature shows its impurities.
Halide anions
add dilute nitric acid (aq) then silver nitrate (aq),then add NH3 in excess
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Anion test
Carbonate : add magnesium carbonate and hydrochloric acid, (bubbles form)
Sulphate: add HCI in barium chloride and a few drops of sodium sulphate( white precipitate formed)