Tests for ions

Question 1

Test for carbonate ions

Answer 1

1. Add dilute nitric acid solution

Effervescence will be observed

2. Bubble the gas produced through limewater

A white precipitate is formed and the solution turns cloudy

Question 2

Test for carbonate ions

Answer 2

1. Add dilute nitric acid solution

Effervescence will be observed

2. Bubble the gas produced through limewater

A white precipitate is formed and the solution turns cloudy

Question 3

Test for Sulfate ions

Answer 3

1. Acidify the solution with HCl to remove carbonate ions
2. Add BaCl2 solution

A white precipitate will form

Question 4

Test for chloride ions

Answer 4

1. Add aqueous AgNO3 solution

A white precipitate is formed

2. Add dilute aqueous NH3

Question 5

Test for Sulfate ions

Answer 5

1. Acidify the solution with HCl to remove carbonate ions
2. Add BaCl2 solution

A white precipitate will form

Question 6

Test for chloride ions

Answer 6

1. Add aqueous AgNO3 solution

A white precipitate is formed

2. Add dilute aqueous NH3

The precipitate will dissolve

Question 7

Test for ammonium ions

Answer 7

1. Add aqueous NaOH solution
2. Warm the solution

effervescence is observed

3. Hold moist pH indicator paper above the solution

The pH indicator paper will turn blue

Question 8

Test for iodide ions

Answer 8

1. Add aqueous AgNO3 solution

A yellow precipitate is formed

2. Add dilute aqueous NH3

The precipitate will not dissolve

3. Add concentrated aqueous NH3

The precipitate will not dissolve

Question 9

What is the correct order for testing anions?

Answer 9

1. Carbonate ion
2. Sulfate ion
3. Halide ion

Question 10

Test for ammonium ions

Answer 10

1. Add aqueous NaOH solution
2. Warm the solution

effervescence is observed