Used to identify the chloring bromine and iodine IONS.
Doesn't react with flourine as flourine has weak F-F bonds. Therefore it froms hydrogen bonds with water molecules and becomes soluble in water. So it cannot form a metal precipitate with silver.
1) Add nitric acid to the soloution to remove any carbonate or hydroxide ions. These could form silver carbonate or hydroxide precipitate.
2)Add silver nitrate to the soloution
Flourine- no precipitate
Chlorine- white precipitate
Bromine- cream precipitate
Iodine- yellow precipitate
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