A3 - Qualitative Analysis

Question 1

What is the test for ammonium ions?

Answer 1

1. Add sodium hydroxide to sample
2. Warm solution
3. Place damp red litmus paper/indicator paper near mouth often test tube
4. If ammonium ions present, indicator paper will turn blue

Question 2

What is the test for carbonate ions?

Answer 2

1. Add dilute nitric acid to sample
2. If you see bubbles, the compounds could be a carbonate
3. Test the gas evolved by bubbling it through limewater
4. If there are carbonate ions present in the test-tube, then the limewater will turn cloudy

Question 3

What is the test for sulphate ions?