Identifying non-metal ions

Question 1

Carbonate ions

Answer 1

1. add dilute acid to sample
2. acid will react with carbonate to produce CO2 gas
3. will see effervescence
4. bubble gas through lime water
5. if cloudy = CO2 present = carbonate in sample

Question 2

Halide ions

Answer 2

1. add dilute nitric acid to sample
2. add dilute silver nitrate to solution
3. halide ions produce a precipitate of the silver halide

Question 3

Halide ions - RESULTS

Answer 3

chloride ions - white precipitate of silver chloride
bromide ions - cream precipitate of silver bromide
iodide ions - yellow precipitate of silver iodide

Question 4

Sulfate ions

Answer 4

1. add dilute hydrochloric acid to sample
2. add barium chloride solution
3. if sulfate ions present, white precipitate will form