Tests for Negative Ions and Gases

Question 1

What is the test for a carbonate ion, CO3

Answer 1

Add dilute acid, then test for CO2 with limewater

Question 2

What is the test for a sulfate ion, SO4 2-

Answer 2

Add a few drops of dilute hydrochloride acid then add a few drops of barium chloride and see if it turns white

Question 3

Halide: What is the test for a chloride ion, Cl-

Answer 3

Add a few drops of nitric acid and then a few drops of silver nitrate and see if it turns white

Question 4

What is the test for oxygen?

Answer 4

Relights a glowing splint

Question 5

What is the test for hydrogen?

Answer 5

Hold a lit splint near gas, listen for a squeaky pop

Question 6

What is the test for carbon dioxide?

Answer 6

Turns limewater cloudy

Question 7

Halide: What is the test for a Br- ion?

Answer 7

Add a few drops of dilute nitric acid then add a few drops dilute silver nitrate then see if it goes cream

Question 8

Halide: What is the test for an I- ion?

Answer 8

Add a few drops of dilute nitric acid then a few drops of dilute silver nitrate then see if it turns yellow

Question 9

What colour precipitate do iodide ions produce?

Answer 9

Yellow precipitate