Chemistry - Chemical Tests

    Cards (14)

    • test for oxygen
      • relights glowing splint if present
    • test for carbon dioxide
      • bubble gas through limewater
      • if present: goes cloudy (due to presence of calcium carbonate)
    • test for ammonia
      • damp red litmus paper turns blue
    • alkenes
      • bromine water decolorizes (from orange)
    • test for hydrogen
      • glowing splint
      • if present: squeaky pop
    • test for water
      • boil at 100 degrees
      • turns blue anhydrous cobalt chloride to pink hydrated cobalt chloride
    • test for chlorine
      • blue litmus paper
      • if present: turns red then bleached white
    • flame test method
      • clean using hydrochloric acid
      • dip wire in compound
      • put in non-luminous flame
      • wire should be nichrome as inert & doesn't give colour
    • flame tests
      • potassium - lilac
      • sodium - yellow
      • lithium - red
      • calcium - orange-red
      • copper - blue-green
    • test for sulphate ions
      • add dilute hydrochloric acid and barium chloride solution
      • if present: white precipitate forms
    • sodium hydroxide precipitate tests
      • method: add sodium hydroxide
      • iron 2+ - green
      • iron 3+ - brown
      • copper - blue
    • test for ammonium
      • add sodium hydroxide
      • gas produced, test for ammonia
    • nitric acid precipitate tests
      • add nitric acid and then silver nitrate
      • nitric acid used to remove carbonate impurities
      • precipitate forms:
      • chloride - white
      • bromide - cream
      • iodide - yellow
    • test for carbonate
      • add dilute hydrochloric acid
      • gas produced, bubble through limewater, should be cloudy
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