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SQA Higher Chemistry Flame Tests

Flame Tests

This page covers the following topics:

1. Flame emission spectroscopy
2. Ions flame tests
3. Identifying compounds

Flame tests are used to detect and identify ions in samples. Instrumental methods of analysis using flame emission spectroscopy are faster, and more accurate and sensitive than simple flame tests.

Flame emission spectroscopy

The flame test allows us to identify metal ions as the flame will show a certain colour for a certain metal ion.

Ions flame tests

We can use flame tests and solutions to analyse a range of ionic compounds.

Identifying compounds

1

A flame test conducted gives the flame shown in the diagram. What metal ion is present?

A flame test conducted gives the flame shown in the diagram. What metal ion is present?

2

We have 4 samples. We carry out a flame test and it gives a lilac colour. We then add dilute nitric acid and silver nitrate and it gives a yellow precipitate. Which sample is it we have tested?

We have 4 samples. We carry out a flame test and it gives a lilac colour. We then add dilute nitric acid and silver nitrate and it gives a yellow precipitate. Which sample is it we have tested?

3

Fill in the gap: Flame tests are used to identify the presence of .... ions in a compound.

Fill in the gap: Flame tests are used to identify the presence of .... ions in a compound.

4

Sodium hydroxide is added to a salt solution and a blue precipitate is given. Nitric acid and silver nitrate are then added and a white precipitate forms. What is the salt?

Sodium hydroxide is added to a salt solution and a blue precipitate is given. Nitric acid and silver nitrate are then added and a white precipitate forms. What is the salt?

5

A salt solution is tested. The flame test gives a yellow flame and the addition of HCl and barium chloride solution gives a white precipitate. What is the salt?

A salt solution is tested. The flame test gives a yellow flame and the addition of HCl and barium chloride solution gives a white precipitate. What is the salt?

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