Reducing power of Halides INCREASES down the group
To reduce something, the halide has to lose an electron from the outer shell. How easy this is depends on the attraction between the nucleus and the outer electrons
As we go down a group, the attraction gets weaker because:
- The ions are bigger, so the electrons are further away from the nucleus
- There are extra inner electrons shells, so there is a greater shielding effect
When the halides reacts with Sulfuric Acid, the following happens
- Fluorine/Chlorine - Not strong enough reducing agent to reduce the sulfuric acid, so HX (X being the halide) is formed
- Bromine - Bromine is strong enough to reduce sulfuric acid, it happens in a redox reaction. The products formed are bromine (diatomic), sulfur dioxide and water
- Iodine - Undergoes 2 redox reactions, first one produces Iodine (diatomic), sulfur dioxide and water, When iodine reacts with sulfur dioxide, it produces H2S, Iodine (diatomic) and water
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