Halide Ions

Question 1

Testing for Halide Ions?

Answer 1

Add Silver nitrate solution

If necessary, adding ammonium : AgCl and AgBr form soluble complex, colourless, AgI forms INSOLUBLE complex, remains yellow

Question 2

Reactions of Halide Ions with Concentrated H2SO4

Answer 2

Question 3

Chlorine + NaOH (cold dilute, and a disproportionation reaction)

Answer 3

Question 4

Chlorine + Water (disproportionation reaction, and its uses, and in sunlight?)

Answer 4

• Chloric acid sterilises water, killing bacteria (healthy benefits by killing bacteria outweigh possible health risks)

In sunlight :
2Cl2 (g) + 2H2O (l) → 4HCl (aq) + O2 (g)

(which is why Cl in swimming pools need to be replenished regularly)