Test for ions

Question 1

How do you test for hydrogen?

Answer 1

Put a lit splint into a test tube and you will hear a squeaky pop if hydrogen is present

Question 1

How do you test for oxygen?

Answer 1

Put a glowing splint into a test tube the match well relight if oxygen is present

Question 2

How do you test for carbon dioxide?

Answer 2

Bubble the gas (co2) into lime water and it will change form colourless to milky if co2 is present

Question 3

How do you test for ammonia?

Answer 3

Put damp red litmus paper into the mouth of a test tube the litmus paper will turn blue if ammonia is present

Question 4

How do you test for chlorine?

Answer 4

Damp blue litmus paper into the mouth of a test tube it will turn white if chlorine is present

Question 5

What are cations?

Answer 5

Positive ions

Question 6

What are anions?

Answer 6

Negative ions

Question 7

What are the 3 test for cations? (3)

Answer 7

1. Flame tests
2. Ammonium test
3. Copper (ll), iron (ll), iron (lll)

Question 8

What are the 3 test for anions?

Answer 8

1. Chloride, bromide, idide
2. Sulphate
3. Carbonate

Question 9

What is the test for water?

Answer 9

Use anhydrous, it will turn from white to blue if water is present

Question 10

What are the 5 ions used in the flame tests and there chemical symbol? (5)

Answer 10

1. Lithium Li^+
2. Sodium Na^+
3. Potassium K^+
4. Calcium Ca^2+
5. Copper Cu^2+

Question 11

How do you carry out a flame test? (3)

Answer 11

1. Dip wire loop into HCl
2. Then into a solid compound
3. Place it under the bunsen flame

Question 12

What is important to keep in mind when carrying out a flame test?

Answer 12

To clean the wire loop each time by dipping it into the HCl

Question 13

What is the positive result for lithium in a flame test?

Answer 13

Crimson

Question 14

What is the positive result for sodium in a flame test?

Answer 14

Yellow

Question 15

What is the positive result for potassium in a flame test?

Answer 15

Lilac

Question 16

What is the positive result for calcium in a flame test?

Answer 16

Brick red

Question 17

What is the positive result for copper in a flame test?

Answer 17

Green

Question 18

How do you carry out the ammonium test? (2)

Answer 18

1. Add sodium hydroxide and warm
2. Test the gas produced with damp litmus paper

Question 19

How do you carry out the test testing for copper (ll), iron (ll), iron (lll)?

Answer 19

1. Add sodium hydroxide

Question 20

What is the positive result for the ammonium test?

Answer 20

Blue/purple

Question 21

What is important to keep in mind during the ammonium test?

Answer 21

The gas tested on the litmus paper in ammonia (NH3)

Question 22

What is the positive result for copper (ll) and the chemical symbol?

Answer 22

Blue precipitate Cu(OH)2

Question 23

What is the positive result for iron (ll) and the chemical symbol?

Answer 23

Green precipitate Fe(OH)2

Question 24

What is the positive result for iron (lll) and the chemical symbol?

Answer 24

Orange precipitate Fe(OH)3

Question 25

How do you carry out the test for chloride, bromide and iodide? (2)

Answer 25

1. Add silver nitrate 2. Then acidify with dilute nitric acid

Question 26

What is the positive result for chloride?

Answer 26

White precipitate

Question 27

What is the positive result for bromide?

Answer 27

Cream precipitate

Question 28

What is the positive result for iodide?

Answer 28

Yellow precipitate

Question 29

How do you carry out the test for sulphate? (2)

Answer 29

1. Add barium chloride 2. Then acidify with dilute HCl

Question 30

What is the positive result for sulphate?

Answer 30

White percipitate

Question 31

How do you carry out the test for carbonate?

Answer 31

1. Add some acid

Question 32

What is the positive result for carbonate?

Answer 32

Cloudly/milky

Question 33

What is the chemical symbol for ammonium?

Answer 33

NH4^+

Question 34

What is the chemical symbol for copper (ll)?

Answer 34

Cu^2+

Question 35

What is the chemical symbol for iron (ll)?

Answer 35

Fe^2+

Question 36

What is the chemical symbol for iron (lll)?

Answer 36

Fe^3+

Question 37

What is the chemical symbol for chloride?

Answer 37

Cl^-

Question 38

What is the chemical symbol for bromide?

Answer 38

Br^-

Question 39

What is the chemical symbol for Iodide?

Answer 39

I^-

Question 40

What is the chemical symbol for sulphate?

Answer 40

SO4^2-

Question 41

What is the chemical symbol for carbonate?

Answer 41

CO3^2-