Tests For Gases And Anions

Question 1

What happens if chlorine his present

Answer 1

Bleaches damp litmus paper turning it from blue to red to white

Question 2

If oxygen is present it will

Answer 2

Relight a glowing splint

Question 3

What happens if carbon dioxide is present

Answer 3

Bubbling or shaking come dioxide with an aqueous solution of calcium hydroxide (lime water) causes the solution to turn cloudy

Question 4

What happens if hydrogen is present

Answer 4

Holding a lit splint over test tube or her a squeaky pop if hydrogen is present

Question 5

How to test for carbonate ions

Answer 5

Add few drops of dilute acid
Bubbled through limewater of carbonate ions are present carbon dioxide will be released and 10 the limewater cloudy

Question 6

Test for sulfates with hydrochloric acid and barium chloride

Answer 6

Using a dropping pet add a couple of drops of dilute hydrochloric acid followed by couple drops of barium solution sulphate ion is present a white precipitate of barium sulphate will form

Question 7

Test for halides with nitric acid and silver nitrate

Answer 7

Add a couple of drops of dilute nitric acid followed by a couple of drops of silver nitrate solution to mystery solution
Chloride gives a white precipitate of silver chloride
Bromide gives a cream precipitate of silver bromide
iodide gives a yellow precipitate of silver iodide