REDUCING ABILITY OF HALIDE IONS INCREASES DOWN GROUP 7
- When a halide ion acts as a reducing agent it GIVES electrons to something else
- The bigger the halide ion the further the electrons are from the nucleus
- The more they are screened by inner electron shells
- Weaker attraction between outer electrons and nucleus
- Easier to lose electrons as you go down the group
Reactions of halide salts and conc. sulfuric acid
- NaCl(s) + H2SO4(l) ==> NaHSO4(s) + HCl(g)
- 2NaBr(s) + 2H2SO4(l) ==> NaHSO4(s) + Br2(g) + SO2(g) + 2H2O(l)
- 8NaI(s) + 5H2SO4(l) ==> 4Na2SO4(s) + 4I2(g/s) + H2S(g) + 4H2O(l)
- NaF(s) + H2SO4(l) ==> NaHSO4(s) + HF(g)
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