Important : chemical tests

Question 1

Steps to carry out a flame test ( 3 steps )

Answer 1

1. Dip nichrome wire into HCl then in Bunsen flame to clean it
2. Dip nichrome wire into sample being tested
3. Hold wire in blue Bunsen flame

Question 2

Flame test : bright red flame =?

Answer 2

Lithium ions

Question 3

Flame test : yellow (orange ) flame =?

Answer 3

Sodium ions

Question 4

Flame test : lilac flame =?

Answer 4

Potassium ions

Question 5

Flame test : brick red flame =?

Answer 5

Calcium ions

Question 6

Flame test : apple green flame =?

Answer 6

Barium ions

Question 7

Flame test : blue green flame =?

Answer 7

Cooper ions

Question 8

Flame test : lithium ions = ?

Answer 8

Bright red

Question 9

Flame test : sodium ions = ?

Answer 9

Yellow ( orange )

Question 10

Flame test : potassium ions = ?

Answer 10

Lilac

Question 11

Flame test : calcium ions = ?

Answer 11

Brick red

Question 12

Flame test : barium ions = ?

Answer 12

Apple green

Question 13

Flame test : copper ions = ?

Answer 13

Blue green

Question 14

Sodium hydroxide test : blue precipitate =?

Answer 14

Copper ions

Question 15

Sodium hydroxide test : dirty green precipitate =?

Answer 15

Iron ( II ) ions

Question 16

Sodium hydroxide test : orange/brown precipitate =?

Answer 16

iron ( III ) ions

Question 17

Sodium hydroxide test : white precipitate =?

Answer 17

Calcium ions

Magnesium ions

Question 18

Sodium hydroxide test : whote precipitate ( re - dissolved with XS ) =?

Answer 18

Aluminium ions

Question 19

Sodium hydroxide test : copper ions =?

Answer 19

Blue precipitate

Question 20

Sodium hydroxide test : iron ( II ) ions =?

Answer 20

Dirty green precipitate

Question 21

Sodium hydroxide test : iron ( III ) ions =?

Answer 21

Orange/ brown precipitate

Question 22

Sodium hydroxide test : calcium ions =?

Answer 22

White precipitate

Question 23

Sodium hydroxide test : magnesium ions =?

Answer 23

White precipitate

Question 24

Sodium hydroxide test : aluminium ions =?

Answer 24

White precipitate ( re - dissolves with XS )

Question 25

Steps for surface ions test ( 3 steps )

Answer 25

1. Sample in test tube
2. Add HCl
3. Add barium chloride solution

Question 26

Result of sulfate ion test ( HCl & barium chloride ) if sulfate ions are present

Answer 26

White precipitate

Question 27

Steps for halide ions test ( 3 steps )

Answer 27

1. sample in test tube
2. Add dilute nitric acid
3. Add silver nitrate

Question 28

Halide ions test : white precipitate = ?

Answer 28

Chloride ions

Question 29

Halide ions test : cream precipitate = ?

Answer 29

Bromide ions

Question 30

Halide ions test : yellow precipitate = ?

Answer 30

Iodide ions

Question 31

Steps for carbonate ions test

Answer 31

1. Add an acid ( eg. HCl )

2. Test gas given off with limewater

Question 32

Results for carbonate ions test if carbonate ions present

Answer 32

Fizzing = CO2 = turn limewater cloudy