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Sulphates and Halides for SQA National 5 Chemistry

Sulphates and Halides

This page covers the following topics:

1. Identification of sulphate solutions
2. Identification of halides

Sulphate ions in solution, can be detected using barium chloride solution.

Identification of sulphate solutions

Halide ions are the ions of the halogens. Halide ions in solution are detected using silver nitrate solution.

Identification of halides

1

What are the halogens?

Elements in Group 7 of the periodic table.

What are the halogens?

2

What is the precipitate that forms?

Barium sulphate.

What is the precipitate that forms?

3

What colour precipitate do bromide ions give? What is this precipitate?

Cream; silver bromide.

What colour precipitate do bromide ions give? What is this precipitate?

4

What colour precipitate do chloride ions give? What is this precipitate?

white, silver chloride

What colour precipitate do chloride ions give? What is this precipitate?

5

Why can we not used sulphuric acid when adding drops of acid to the original solution?

It contains sulphate ions - these would interfere with the test results.

Why can we not used sulphuric acid when adding drops of acid to the original solution?

End of page

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