3: Chemical Analysis

Question 1

Oxygen Test

Answer 1

Place glowing splint in test tube with oxygen, oxygen will relight the splint

Question 2

Hydrogen Test

Answer 2

Put lit splint in gas. If hydrogen is present, there will be a squeaky pop

Question 3

Carbon Dioxide Testing

Answer 3

Bubble it through limewater. Limewater will go cloudy.

Question 4

Flame test for Lithium

Answer 4

Crimson flame

Question 5

Flame test for Sodium

Answer 5

Yellow flame

Question 6

Flame test for potassium

Answer 6

Lilac flame

Question 7

Flame test for calcium

Answer 7

Orange-red flame

Question 8

Flame test for copper

Answer 8

Green flame

Question 9

Carbonate ions testing

Answer 9

Add Hydrochloric acid, if carbonate ions are present bubbles of Carbon Dioxide will form

Question 10

Test for Sulfate Ions

Answer 10

Use acidified barium chloride. Produces a white precipitate

Question 11

Testing for Chlorine ions

Answer 11

Use acidified silver nitrate. Halide ion test. White precipitate will form

Question 12

Testing for Barium ions

Answer 12

Halide test, add acidified silver nitrate. Cream precipitate forms.

Question 13

Testing for Iodine ions

Answer 13

Halide test. Add acidified silver nitrate. Yellow precipitate forms

Question 14

Testing for Copper (II) ions

Answer 14

Cation testing. Add Sodium Hydroxide. Blue precipitate forms

Question 15

Testing for Iron (II) ions.

Answer 15

Cation testing. Add Sodium Hydroxide. Green precipitate forms.

Question 16

Testing for Iron (III) ions.

Answer 16

Cation testing. Add Sodium Hydroxide. Brown precipitate forms.

Question 17

Testing for Calcium ions.

Answer 17

Cation testing. Add Sodium Hydroxide. White precipitate forms.

Question 18

Testing for Magnesium ions.

Answer 18

Cation testing. Add Sodium Hydroxide. White precipitate forms.

Question 19

Testing for Aluminium ions.

Answer 19

Cation testing. Add Sodium Hydroxide. White precipitate forms, but dissolves in excess Sodium Hydroxide.

Question 20

How to tell the difference between Calcium, Magnesium and Aluminium after positive ions test:

Answer 20

Do a flame test with calcium: orange-red flame should be produced.
Aluminium: white precipitate should dissolve in excess sodium hydroxide.
Magnesium: nothing else can be done.

Question 21

What element produces a crimson flame?

Answer 21

Lithium

Question 22

What element produces a yellow flame?

Answer 22

Sodium

Question 23

What element produces a lilac flame?

Answer 23

Potassium

Question 24

What element produces an orange-red flame?

Answer 24

Calcium

Question 25

What element produces a green flame?

Answer 25

Copper

Question 26

What element produces white precipitate in Sodium Hydroxide?

Answer 26

Calcium, magnesium and aluminium

Question 27

What element produces brown precipitate in Sodium Hydroxide?

Answer 27

Iron (III) ions

Question 28

What element produces green precipitate in Sodium Hydroxide?

Answer 28

Iron (II) ions.

Question 29

What element produces blue precipitate in Sodium Hydroxide?

Answer 29

Copper (II) ions.

Question 30

What do we use acidified barium chloride to test for?

Answer 30

Sulfate ions

Question 31

What do we use Hydrochloric acid to test for?

Answer 31

Carbonate ions

Question 32

In acidified silver nitrate, what ion produces white precipitate?

Answer 32

Chlorine- ions (Cl-)

Question 33

In acidified silver nitrate, what ion produces cream precipitate?

Answer 33

Barium- ions (Br-)

Question 34

In acidified silver nitrate, what ion produces yellow precipitate?

Answer 34

Iodine- ions (I-)