Tests for ions and gases

Question 1

Flame test for lithium

Answer 1

burns with a crimson red flame

Question 2

Flame test for Sodium

Answer 2

burns with a yellow orange flame

Question 3

Flame test for Potassium

Answer 3

burns with a lilac flame

Question 4

Flame test for Calcium

Answer 4

burns with a brick red flame

Question 5

Test for ammonia (NH4+)

Answer 5

Add sodium hydroxide to a solution, if ammonia is present the potent gas is given off

Question 6

Test using sodium hydroxide solution
Copper
Iron 2+
Iron 3+

Answer 6

Blue
Sludgy green
Reddish brown

Question 7

Test for halides

Chloride, Bromide, iodide

Answer 7

Add dilute nitric acid followed by silver nitrate 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

Question 8

Test for sulfate ion

Answer 8

Add dilute HCL followed by barium chloride
SO 4(2+) will form a white precipitate if present

Question 9

Test to detect carbonates

Answer 9

Add dilute hydrochloric acid if carbonates are present then carbon dioxide will be released
You can test for carbon dioxide using lime water

Question 10

Test for chlorine gas

Answer 10

Chlorine bleaches damp litmus paper

Question 11

Test for Oxygen

Answer 11

Relights a glowing splint

Question 12

Test for Carbon Dioxide

Answer 12

Turns limewater cloudy

Question 13

Test for Hydrogen

Answer 13

Makes a squeaky pop with a lighted splint

Question 14

Test for Ammonia

Answer 14

Turns damp litmus paper blue