ION TESTS

• Ammonium Ion, NH4+

  • add dilute, aqueous NaOH, warm gently
  • test the gas produced with damp red litmus paper
  • ammonia gas turns litmus paper blue
• Carbonate Ion, CO3-2

  • add small amount of HCl acid
  • effervescence is produced due to production of CO2
  • bubble gas through limewater, turns cloudy if co2 is present
• Sulphate Ions: SO4 2-

  • acidify with HCl acid
  • add aqueous BaCl2
  • white precipitate of insoluble BaSO4
• Order for Anion Tests

  • Carbonate, Sulfate, Halide
  • CASH