Testing for NEGATIVE IONS

Question 1

What is the test for carbonate ions?

Answer 1

Add dilute acid to solid

Question 2

What are the observations if carbonate ions are present?

Answer 2

Fizzing vigorously. Carbon dioxide produced

Question 3

What is the test for chloride ions?

Answer 3

Acidify solution with dilute nitric acid then add aqueous silver nitrate

Question 4

What are the observations if chloride ions are present?

Answer 4

A white precipitate is formed

Question 5

What is the test for bromide ions?

Answer 5

Acidify solution with dilute nitric acid then add aqueous silver nitrate

Question 6

What are the observations if bromide ions are present?

Answer 6

A creamy precipitate is formed

Question 7

What is the test for iodide ions?

Answer 7

Acidify solution with dilute nitric acid then add aqueous silver nitrate

Question 8

What are the observations if iodide ions are present?

Answer 8

A yellow precipitate is formed

Question 9

What is the test for sulphate ions?

Answer 9

Acidify solution with dilute hydrochloric acid then add barium chloride solution

Question 10

What are the observations if sulphate ions are present?

Answer 10

White precipitate is formed

Question 11

What is the test for hydroxide ions?

Answer 11

Add drops of full range universal indicator

Question 12

What are the observations if hydroxide ions are present?

Answer 12

The solution turns purple showing that hydroxide ions are alkaline