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8.3 Identification of ions by chemical and spectroscopic means

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Question 21

A solution contains one halide ion. The solution may also be contaminated with carbonate ions.

A student tests separate samples of the solution.

TestReagents added, in orderObservation
1Silver nitrate solutionCream-coloured precipitate
2Dilute nitric acid, then silver nitrate solutionCream-coloured precipitate

Give the halide ion in the solution. Explain why Test 1 cannot be used to identify the halide ion reliably and how Test 2 gives a reliable identification.

[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

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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