Testing for positive and negative ions

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  • Testing For Ions
    • Positive
      • Can use a flame test
      • Different colour flames indicate different ions
        • Potassium = LILAC
      • Metal Ions
    • Negative
      • Testing for Carbonates
        • Add dilute acid to the solution
          • Bubble it through  the limewater
            • If it becomes cloudy then a carbonate is present
      • Testing for Sulphates
        • Add dilute HCL and a barium chloride solution
          • If a white precipitate is formed then the original compound was a sulphate
      • Testing for Halides
        • Add dilute nitric acid
          • And then a silver nitrate solution
          • Chloride = WHITE precipitate
          • Bromide = CREAM precipitate
          • Iodide = YELLOW precipitate
  • Calcium = RED
  • Lithium = CRIMSON
  • Barium = GREEN
  • Observe the colour of the precipitate formed
    • Add aqueous sodium hydroxide to the unknown solution
    • Copper = BLUE
    • Iron = GREEN and RED
    • Calcium = White
  • Sodium = YELLOW

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