Halogens

bleach has got sodium hypochlorate in it

Tests for group 7

Silver nitrate -

• Use nitric acid first to remove carbonate ions

• Cl- = white precipitate that dissolves in ammonia

• Br- = cream precipitate that dissolves only in concentrated ammonia

• I- = yellow precipitate that doesn’t dissolve

Sulfate test

• + BaCl2

• white precipitate (BaSO4 is insoluble)

hydroxide

• turns red litmus paper blue

carbonate

• add acid - capture gas + bubble through limewater → cloudy