Identifying Non-metal Ions

Question 1

How do you test for a carbonate ion?

Answer 1

1. Add dilute acid to the sample
2. The acid will react to form carbon dioxide gas and fizzing
3. Bubble the gas through limewater and if it goes cloudy then it is carbon dioxide

Question 2

How do you test for a halide ion?

Answer 2

1. Add dilute nitric acid to the sample
2. Add dilute silver nitrate solution
3. Halide ions produce a precipitate if the silver halide each with a different colour

Question 3

What colour halide ion has a white precipitate ?

Answer 3

Chloride ions

Question 4

What colour halide ion has a cream precipitate ?

Answer 4

Bromide ions

Question 5

What colour halide ion has a yellow precipitate ?

Answer 5

Iodide ions

Question 6

How do you test for a sulphate ion?

Answer 6

1. Add dilute hydrochloric acid to the sample
2. Add barium chloride solution
3. if sulphate ions are present, a white precipitated is formed