Test For cations and anions

Question 0

What are anions?

Answer 0

Anions are negative ions
Non metal ions
Gained electrons

Question 1

What are cations?

Answer 1

Positive ions
Metal ions
Lost electrons

Question 2

How is ammonium made?

Answer 2

By the haber process

Question 3

How do you do a flame test?

Answer 3

1) clean a nichrome wire by putting in a Bunsen flame and then into hydrochloric acid
2) dip the nichrome into powdered substance
3) put in a blue Bunsen flame and observe colour of flame

Question 4

What ions are present with a lilac flame?

Answer 4

Potassium ions (K+)

Question 5

What colour is the flame in a flame test if calcium (Ca2+) ions are present?

Answer 5

Brick red

Question 6

What ions are present if the flame goes a crimson/dark red colour ?

Answer 6

Lithium ions (Li+)

Question 7

What colour flame does sodium (Na+) ions show in a flame test?

Answer 7

Yellow/orange

Question 8

How do you test for ammonium ions?

Answer 8

1. Add sodium hydroxide to sample and gently heat it

2. Put Damp red litmus paper in and if it goes blue ammonium ions are present

Question 9

What colour does red litmus paper turn if ammonium ions are present?

Answer 9

Blue

Question 10

What is a precipitate?

Answer 10

Insoluble solid formed from 2 aqueous solutions

Question 11

How do you so a precipitation reaction to test for cations?

Answer 11

1. Add sodium hydroxide into a text tube with solution

2. See if a precipitate forms

Question 12

If copper ions are present what colour will the precipitate be?

Answer 12

Blue

Question 13

Does iron (II) or iron (III) produce a red/ brown precipitate?

Answer 13

Iron (III)

Question 14

What colour precipitate is formed when iron (II) ions are present?

Answer 14

Dark green

Question 15

What is the definition of an ion?

Answer 15

Substances that have been given a charge by either gaining or losing electrons which gives them either a positive or negative charge

Question 16

How do you test for sulphate ions?

Answer 16

1. Add hydrochloric acid to a test tube with the sample
2. Add few drops of barium chloride
3. shake gently

Question 17

What is the formula for sulphate ions?

Answer 17

SO4

Question 18

What is formed when barium chloride is added to hydrochloric acid?

Answer 18

Barium sulphate

Question 19

What colour is the precipitate formed when sulphate ions are present?

Answer 19

White precipitate

Question 20

How do you test for halide ions?

Answer 20

1. Add few drops of nitric acid to test tube
2. Add few drops of silver nitrate
3. Gently shake

Question 21

What colour is the precipitate when chloride (Cl-) ions are present?

Answer 21

White

Question 22

do bromide ions form cream precipitate or a yellow precipitate?

Answer 22

Cream precipitate formed when bromide ions are present

Question 23

What colour is the precipitate formed when iodide ions are present?

Answer 23

Yellow

Question 24

How do you test for carbonate ions?

Answer 24

1. Add dilute hydrochloric acid to test tube with sample

2. if carbonate ions are present carbon dioxide releases

Question 25

How can you tell if carbon dioxide is produced?

Answer 25

Carbon dioxide turns limewater cloudy or milky

Question 26

What is the formula for carbonate ions?

Answer 26

2-

CO3