4.6.3 - Anion Tests

Question 1

What is an anion !?

Answer 1

Anions and negative ions

Question 2

How can you test for halides!?

Answer 2

We test a sample for halide ions using the silver nitrate test

Question 3

How do you conduct a silver nitrate test?

Answer 3

1. Dissolve the sample in water.
2. Add nitric acid.
3. Add silver, nitrate solution
   

Question 4

What halide produces a white precipitate !?

Answer 4

. Chlorine

Question 5

What halide produces a cream precipitate !?

Answer 5

Bromine

Question 6

What halide produces a yellow precipitate !?

Answer 6

Iodine

Question 7

How do you test for a carbonate !?

Answer 7

1. Add hydrochloric acid, look for effervescence.
2. If there is effervescence bubble, gas through limewater.

Question 8

What happens to the limewater if carbonate ions are present !?

Answer 8

. If carbonate ions are present, the sample of the gas evolved turns, limewater cloudy

Question 9

How do you test for a sulphate !?

Answer 9

1. Add hydrochloric acid, look for effervescence.
2. If there is no effervescence, add barium chloride solution.

Question 10

What colour does barium chloride solution turn if sulphate ions are present !?

Answer 10

. If sulphate ions are present, they will form a white precipitate with the barium ions from the barium chloride.