Qualitative Analysis

Question 1

When carbonates react with acid what do they form

Answer 1

CO2

Question 2

What is the equation for the reaction between potassium carbonate and nitric acid

Answer 2

Question 3

What is the observation at first when you add an acid to a carbonate

Answer 3

Effervescence

Question 4

How do you carry out the test for carbonate ions

Answer 4

Add any acid to sample and if effervescence occurs then bubble the gas through limewater and it turns cloudy then CO2 is produced and there were carbonate ions

Question 5

Show the reaction for limewater turning cloudy

Answer 5

Question 6

Why is it best to use nitric acid to test for carbonate ions

Answer 6

So you can test the same sample for halides and sulfates because nitric acid doesn’t contain any of those

Question 7

When testing for sulfates what are the two solutions you can use
What is the best one

Answer 7

Barium nitrate - because same sample can be tested for halide ions

Question 8

Explain the test for ammonium ions

Answer 8

Add aqueous OH ions to sample in test tube which will form ammonia gas
Place in water bath and hold damp litmus paper above it
Turns litmus paper blue