Tests for Anions

Question 1

Descibe the test to see if carbonates are present

Answer 1

1. Add a dilute acid
2. The carbonate and acid will react and form carbon dioxide and so effervesence is given off
3. Bubble the gas through limewater, if the limewater turns cloudy white it means that carbon dioxide is present and so we started with a carbonate

Question 2

Describe the test to see if halide ions are present

Answer 2

1. Add dilute nitric acid
2. Add dilute silver nitrate
3. A silver halide will be formed

Question 3

What colour is silver chloride precipitate?

Answer 3

White

Question 4

What colour is silver bromide precipitate?

Answer 4

Cream

Question 5

What colour is silver iodide precipitate?

Answer 5

Yellow

Question 6

Describe the test to see if sulfate ions are present

Answer 6

1. Add dilute hydrochloric acid
2. Add barium chloride solution
3. If sulfate ions are present, a white precipitate will form