Tests Tube Reactions

Question 1

What is a common method used to identify a carbonate ion?

Answer 1

Adding dilute hydrochloric acid (HCl) and observing the production of carbon dioxide gas (bubbles).

Question 2

How would you identify a chloride ion in a solution?

Answer 2

Add a few drops of silver nitrate (AgNO3) solution, which will produce a white precipitate (AgCl).

Question 3

How do you test for ammonia gas?

Answer 3

Use damp red litmus paper. It turns blue in the presence of ammonia.

Question 4

How do you test for sulfate ions?

Answer 4

Add dilute hydrochloric acid, then add barium chloride solution. A white precipitate of barium sulfate (BaSO4) forms.

Question 5

Why is barium chloride solution used in the sulfate test?

Answer 5

Barium ions form a white insoluble precipitate with sulfate ions.

Question 6

How do you test for carbonate ions?

Answer 6

Add dilute hydrochloric acid to a solution containing carbonate ions. The gas produced turns limewater (calcium hydroxide solution) milky.

Question 7

What gas is produced when hydrochloric acid reacts with carbonate ions?

Answer 7

Carbon dioxide gas (CO2).