Testing For Ions And Gasses

Question 1

What are the tests for cations?

Answer 1

1. Flame tests
2. Precipitate test with sodium hydroxide
3. Warm solution and add red litmus paper

Question 2

What are the tests for Anions?

Answer 2

1. Add nitric acid followed by aqueous silver nitrate
2. Add hydrochloric acid followed by aqueous barium chloride
3. Add dilute hydrochloric acid and bubble the gas given off in lime water

Question 3

If the flame test results red what cation would it be?

Answer 3

Lithium Li+

Question 4

If the flame test results yellow what Cation would it be?

Answer 4

Sodium Na+

Question 5

If the flame test results lilac what cation would it be?

Answer 5

Potassium K+

Question 6

If the flame test results blue green what cation would it be?

Answer 6

Copper (ll) Cu2+

Question 7

If the flame test results orange-red what cation would it be?

Answer 7

Calcium Ca2+

Question 8

What color would the flame test for Copper (ll) be?

Answer 8

Blue-green

Question 9

What color would the flame test for Lithium be?

Answer 9

Red

Question 10

What color would the flame test for Potassium be?

Answer 10

Lilac

Question 11

What color would the flame test for sodium be?

Answer 11

Yellow

Question 12

What color would the flame test for calcium be?

Answer 12

Orange-red

Question 13

Describe a flame test for cations.

Answer 13

Dip the nichrome wire into hydrochloric acid then put it in the sample and then above a non luminous flame.

Question 14

Describe a test for Cation precipitate.

Answer 14

Make a solution of the unknown and sodium hydroxide to get a a precipitate.

Question 15

What is the precipitate color of the cation Iron (ll)?

Answer 15

Green precipitate

Question 16

What is the precipitate color of the cation Iron (lll)?

Answer 16

Orange-brown precipitate

Question 17

What is the precipitate color of the cation copper (ll)?

Answer 17

Blue precipitate

Question 18

What test do you do if you got no precipitate or flame for a cation test?

Answer 18

You warm the solution (with sodium hydroxide) and hold a damp red litmus paper above the test tube. (Ammonia gas)

Question 19

What is the difference between ammonia and ammonium?

Answer 19

ammonia is the gas given of
ammonium is the cation

Question 20

What cation would a green precipitate be?

Answer 20

Iron (ll) Fe2+

Question 21

What cation would a orange-brown precipitate be?

Answer 21

Iron (lll) Fe3+

Question 22

What cation would a blue precipitate be?

Answer 22

Copper (ll) Cu2+

Question 23

What is the precipitate color for the anion Chlorine?

Answer 23

White precipitate

Question 24

What is the precipitate color for the anion Bromine?

Answer 24

Cream precipitate

Question 25

What is the precipitate color for the anion Iodine?

Answer 25

Yellow precipitate

Question 26

If you added nitric acid followed by aqueous silver nitrate and got a yellow precipitate what anion would it be?

Answer 26

Iodine

Question 27

If you added nitric acid followed by aqueous silver nitrate and got a cream precipitate what anion would it be?

Answer 27

Bromine

Question 28

If you added nitric acid followed by aqueous silver nitrate and got a white precipitate what anion would it be?

Answer 28

Chlorine

Question 29

If you added nitric acid followed by aqueous silver nitrate and didn’t get any precipitate what are the other possible anions (GCSE)

Answer 29

Sulfate ( SO2- 4 ) or carbonate ( CO2- 3)

Question 30

What is the test for a sulfate anion?

Answer 30

Add hydrochloric acid followed by aqueous barium chloride to get a white precipitate

Question 31

What color is the precipitate for sulfate in the a positive anion test.

Answer 31

White precipitate

Question 32

What is the test for carbonate in an anion test

Answer 32

Add hydrochloric acid and if it bubbles and gives off a gas that turns limewater cloudy it is carbonate

Question 33

What is the test for Hydrogen?

Answer 33

Burns a lit splint with a squeaky pop

Question 34

What is the test for ammonia?

Answer 34

Turns damp red litmus paper blue

Question 35

What is the test for oxygen?

Answer 35

Relights a glowing splint

Question 36

What is the test for chlorine?

Answer 36

Bleaches damp red/blue litmus paper

Question 37

What is the test for Carbon dioxide?

Answer 37

Bubbles through lime water which turns it cloudy

Question 38

What is the test for water? Physical and chemical

Answer 38

Physical = check boiling and freezing point 100* Chemical = white anhydrous copper (II) sulphate turns blue