Halide ions + Sulphuric acid

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1. NaI + H2SO4 ->

  • NaHSO4 + HI ... 6HI + SO2 -> H2S + 3I2 + 2H2O
  • NaHSO4 + HI ... 2HI + H2SO4 -> I2 + SO2 + 2H2O ... 6HI + SO2 -> H2S + 3I2 + 2H2O
  • NaHSO4 + HI ... 2HI + H2SO4 -> I2 + SO2 + 2H2O
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2. NaBr + H2SO4 ->

  • NaHSO4 + HBr ... 2HBr + H2SO4 -> Br2 + SO2 + 2H2O
  • NaHSO4 + HBr
  • NaHSO4 + HBr ... H2S + 3Br2 + H2O

3. NaCl + H2SO4 ->

  • NaHSO4 + HCl
  • Cl2 + SO2 + 2H2O
  • H2S + Cl + SO2

4. What do you see when HCl is formed?

  • nothing
  • misty fumes
  • white precipitate
  • orange fumes

5. What do you see when NaI reacts with H2SO4

  • white ppt
  • HI gas, solid iodine
  • orange fumes

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