Anions Test

Question 1

carbonate test

Answer 1

test: add hydrochloric acid, bubble through limewater

observations: effervesence of carbon dioxide, limewater turns cloudy

Question 2

halogens

Answer 2

test: add nitric acid, add silver nitrate/lead ll nitrate

chlorine: white precipitate, bromine: creamy precipitate, iodine: yellow

Question 3

nitrate test

Answer 3

test: zinc/alluminium foil, sodium hydroxide, warm gently, test with red lithmus paper

ammonia gas turns damp red litmus paper blue, pungent smell ammonia gas

Question 4

sulphate

Answer 4

test: hydrocloric acid, barium chloride/ barium nitrate

observations: forms white precipitate

Question 5

sulphite

Answer 5

test: add sulphuric acid, pottasium manganete

observations: pottasium manganete turns colour from purple to colourless

Question 6

Why nitrica acid before lead nitrate/ silver nitrate

Answer 6

to remove carbonate ions which form insoluble salts