Testing for Negative ions

tricky stuff

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  • Created by: Georgina
  • Created on: 24-05-11 13:23

Carbonate ions

1. Add dilute HCl.

2. It should fizz and a colourless gas given off.

The gas is CO2

3. Do a limewater test if it fizzes.

Limewater should turn cloudy.

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Sulfate ions

1. Add dilute HCl.

2. It should NOT fizz.

3.Add BaCl2 (Barium Chloride).

A White precipitate is formed

2 of 6

Chloride ions

1. Add AgNO3 (Silver Nitrate).

2. Add dilute HNO3 (Nitric acid).

A White precipitate is formed.

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Bromide ions

1. Add AgNO3 (Silver Nitrate).

2. Add dilute HNO3 (Nitric acid).

A Cream precipitate is formed.

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Iodide Ions

1. Add AgNO3 (Silver Nitrate).

2. Add dilute HNO3 (Nitric acid).

A Yellow precipitate is formed.

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Nitrate ions

1. Heat with NaOH (Sodium Hydroxide)

2. No ammonia is given off.

3. Add Al power (Aluminum powder) and heat.

4. NH3 smell is given off.

Turns litmus paper blue.

6 of 6

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