IGCSE Chemistry: Tests and gas tests for anions
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Last updated 9:57 PM on 9/8/22
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13 Terms
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ammonia (NH3)
turns damp, red litmus paper blue
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carbon dioxide (CO2)
Turns limewater milky
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Chlorine (Cl2) gas
bleaches damp litmus paper
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hydrogen (H2)
'pops' with a lighted splint
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oxygen (O2)
Relights a glowing splint
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Sulfur Dioxide (SO2)
turns acidified aqueous potassium manganate(VII) from purple to colourless
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carbonate (CO3 2-) - add dilute acid
effervescence, carbon dioxide produced
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chloride (Cl-) - acidify with dilute nitric acid, then add aqueous silver nitrate
white ppt.
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bromide (Br-) - acidify with dilute nitric acid, then add aqueuous silver nitrate
cream ppt.
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iodide (I-) - acidify with dilute nitric acid, then add aqueuous silver nitrate
yellow ppt.
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nitrate (NO3-) - add aqueous sodium hydroxide, then aluminium foil; warm carefully
ammonia produced
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sulfate (SO4 2-) - acidify, then add aqeuous barium nitrate
white ppt.
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sulfite (SO3 2-) - add dilute hydrochloric acid, warm grently and test for the presence of sulfur dioxide
sulfur dioxide produced will turn acidified aqeuous potassium manganate(VII) from purple to colourless
Note 
Flashcards (56)