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8.3 Identification of ions by chemical and spectroscopic means

8.3 Identification of ions by chemical and spectroscopic means

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Question 1

This question is about identifying ions in chemical compounds.

a.

What colour flame would copper(II) ions produce?

[1]
b.

Name a metal ion that would produce a crimson flame.

[1]
c.

A waste sample contains a mixture of multiple dissolved metal chlorides. Explain why a simple flame test is unsuitable for identifying all the individual metal cations present in this mixture.

[1]
d.

An analyst investigating borehole water suspects contamination by a specific halide. On adding dilute nitric acid followed by silver nitrate solution to the water sample, a cream precipitate is obtained. Name the halide ion present in the water.

[1]
e.

Describe a chemical test to show the presence of sulfate ions (SO42−SO_4^{2-}SO42−​) in an aqueous solution. Describe the observations that confirm their presence.

[3]
Markscheme

8.3 Identification of ions by chemical and spectroscopic means Questions

  1. GCSE
  2. /Chemistry
  3. /8.3 Identification of ions by chemical and spectroscopic means

29 exam-style questions on AQA GCSE Chemistry 8.3 Identification of ions by chemical and spectroscopic means, covering 8.3.1 Flame tests, 8.3.2 Metal hydroxides, 8.3.3 Carbonates, 8.3.4 Halides, 8.3.5 Sulfates, 8.3.6 Instrumental methods, and 8.3.7 Flame emission spectroscopy. Each one has a worked solution and a mark scheme showing where the marks go.

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