Tests For Cations + Anions

Question 1

What is the test for li+?

Answer 1

Burns with a crimson red flame

Question 2

What is the test for K+?

Answer 2

Burns with a lilac flame

Question 3

What is the test for Na+?

Answer 3

Burns with a yellow flame

Question 4

What is the test for Ca 2+?

Answer 4

Burns with a brick red flame

Question 5

What is the test for ammonium ions?

Answer 5

Add Sodium Hydroxide and test the gas produced with damp red litmus paper. A positive result will be the litmus paper turns blue

Question 6

What is the test for Cu 2+?

Answer 6

Add Sodium Hydroxide, a blue precipitate forms

Question 7

What is the test for Fe 2+?

Answer 7

Add Sodium Hydroxide, a green precipitate forms

Question 8

What is the test for Fe 3+?

Answer 8

Add Sodium Hydroxide, a orange/brown precipitate forms

Question 9

How do you test for Halides? (Cl-, Br-, I-)

Answer 9

Nitric acid followed by silver nitrate solution. Followed by ammonia solution.

Question 10

What is the positive result for chloride ions?

Answer 10

A white precipitate is formed. The precipitate is soluble in ammonia solution.

Question 11

What is the positive result for Bromide ions?

Answer 11

A cream precipitate is formed. The precipitate is partially soluble in dilute ammonia solution.

Question 12

What is the positive result for iodide ions?

Answer 12

A yellow precipitate is formed. The precipitate is not soluble in dilute ammonia solution

Question 13

How do you test for sulfate ions?

Answer 13

Add dilute hydrochloric acid followed by barium chloride.

Question 14

What is the positive result for sulphate ions?

Answer 14

A white precipitate is formed

Question 15

How do you test for carbonate ions?

Answer 15

Add dilute hydrochloric acid

Question 16

What is the positive result?

Answer 16

Bubbles of carbon dioxide are given off