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8.3 Identification of ions by chemical and spectroscopic means

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Question 30

A technician tests a solution from a water-treatment process. The solution contains only one of aluminium ions, calcium ions or magnesium ions.

TestObservation
Add a small amount of sodium hydroxide solutionA white precipitate forms
Add excess sodium hydroxide solutionThe white precipitate remains

The technician concludes that the solution contains magnesium ions.

Explain whether the technician's conclusion is justified.

[2]
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

93 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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