AQA GCSE Chemistry Chemical Analysis

  • Created by: whysonari
  • Created on: 25-09-18 19:36
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  • Testing for Gases,  Cations+ Anions.
    • Cations
      • Flame Tests - metal ion is put under blue flame the ions change the colour
        • Cu2+ ions = green flame
        • Li+ ions = crimson flame
        • Na+ ions  = yellow flame
        • Ca2+ ions = orange red flame.
        • K+ ions = lilac flame
      • Precipitates-sodium hydroxide is added to a solution and a precipitate forms
        • Calcium = white precipitate
        • magnesium = white precipitate.
        • Aluminium = white precipitate but redissolves with excess NaOH
        • Copper(II) = blue precipitate
        • Iron(II) = green precipitate.
        • Iron(III) = brown precipitate.
    • Anions
      • Halides Test - nitric acid + silver nitrate
        • Fluoride = white precipitate
        • chloride = cream precipitate
        • bromide = yellow prepitate
      • Testing for sulfates. dilute hydrochloric acid + barium chloride
        • white precipitate = sulfate is present.
    • Common Gases
      • oxygen relights a glowing splint
      • carbon dioxide turns limewater cloudy.
      • Chlorine bleachs DAMP litmus paper.
      • hydrogen - lit splint is held under it makes a squeaky pop

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