Chemistry C3 - Tests for gases and ions These revision cards will hopefully help you to remember these:D 3.0 / 5 based on 1 rating ? ChemistryTesting and analysing substancesGCSEAQA Created by: Spongebob:)Created on: 23-05-11 18:21 GASES Carbon dioxide turns limewater cloudy. Oxygen will relight a glowing splint. Hydrogen will make a squeaky pop when with a lit splint. Ammonia turns red litmus paper blue. 1 of 4 POSITIVE IONS When you add sodium hydroxide: Ca2+ gives a white precipitate. Cu2+ turns blue. Fe2+ turns green. Fe3+ turns brown. Al3+ turns white then clear. 2 of 4 FLAME TESTS Na+ turns orange. K+ turns lilac. Ca2+ turns red. Cu2+ turns green. 3 of 4 NEGATIVE IONS Carbonate Ions ----> 1) add hydroclauric acid 2) gives of carbon dioxide Sulphate Ions ----> 1) add hydroclauric acid 2) add barium chloride 3) white precipitate formed Halide Ions ----> 1) add nitric acid 2) add silver nitrate 3) precipitate formed Nitrate Ions ----> 1) add aluminium 2) add sodium hydroxide 3) makes ammonia 4 of 4
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