Tests for anions

    Cards (6)

    • Test for carbonate ions
      1. Add dilute hydrochloric acid to test sample
      2. Bubble gas produced through lime water
      3. Lime water turns cloudy = positive test result
    • Carbonate ions react with acid to form carbon dioxide gas and water
    • Test for sulfate ions
      1. Add dilute hydrochloric acid to remove impurities
      2. Add barium chloride solution
      3. White precipitate forms = positive test result
    • Barium ions react with sulfate ions to form a white precipitate of barium sulfate
    • Test for halide ions
      1. Add dilute nitric acid to remove impurities
      2. Add silver nitrate solution
      3. White precipitate = chloride, cream precipitate = bromide, yellow precipitate = iodide
    • Silver ions react with halide ions to form differently coloured precipitates