qualitative analysis

• Iodide ion


  • Strongest reducing agent of all the halide ions
  • Outer electrons are further from the positive nucleus
  • Experiences more shielding
  • Makes it easier to donate electrons
• Bromide


  • Only strong enough to reduce sulfur from +6 (in H2SO4) to +4 (in SO2)
• Iodide


  • Strong enough to reduce sulfur from +6 (in H2SO4) to +4 (in SO2(g)), to 0 (in S) and -2 (in H2S)