Tests for Ions

  • Created by: Emma
  • Created on: 10-03-17 10:42
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  • Tests for Ions
    • Carbonates
      • Carbonates react with acids to form carbon dioxide gas.
      • Add a dilute acid e.g Hydrochloric acid
    • Sulphates
      • Add Hydrochloric acid and Barium Nitrate
      • A dense white precipitate forms when Ba2+ ions are added to a solution containing sulphate ions.
      • Barium Sulphate is insoluble
    • Halides
      • Add Silver Nitrate
      • Silver Bromide (AgBr) is a cream precipitate.
        • AgBr only dissolves in concentrated Ammonia.
      • Silver Chloride (AgCl) is a white precipitate
        • AgCl dissolves in both dilute and concentrated Ammonia.
      • Silver Iodide (AgI) is a yellow precipitate.
        • AgI does not dissove in concentrated or dilute Ammonia.
    • Ammonium Compounds
      • Add warm Sodium Hydroxide
      • Damp piece of red litmus paper
        • If Ammonia ions are presents, litmus paper turns blue
      • Litmus paper is damp in order for the Ammonia gas to dissolve.
  • Bubble gas through lime water
    • Carbonates
      • Carbonates react with acids to form carbon dioxide gas.
      • Add a dilute acid e.g Hydrochloric acid
    • A saturated aqueous solution of Calcium Hydroxide

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