Halide ions

Halide ions

Reducing power increases down the group
1. The ions get bigger
  1. Electrostatic attraction between the valance electron and the nucleus decreases
Reaction with sulfuric acid (H2SO4)
1. NaF or NaCl
  1. Misty fume
    1. HF or HCl
  2. Produces NaHSO4
2. NaBr
  1. Misty fumes
    1. HBr
3. NaI
  1. 1. same initial reaction giving off HI gas
  2. 2. HI then reduces H2SO4
    1. Producing SO2
  3. 3. HI reduces SO2 to H2S
    1. A eggy toxic gas
Test for halides
1. 1. add dilute nitric acid
  1. remove impurities
2. 2. add SILVER NITRATE SOLUTION
3. A precipitate is formed
  1. Fluoride: no precipitate Chloride: white precipitate Bromide: cream precipitate Iodide: yellow precipitate
  2. Add ammonia to be sure..
    1. Dilute ammonia
      1. Chloride dissolves
    2. Concentrated ammonia
      1. Bromide dissolves
      2. Iodide is insoluble

Zusammenfassung der Ressource

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