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8.3 Identification of ions by chemical and spectroscopic means

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Question 11

A colourless liquid is leaking from one of two pipes. One pipe contains calcium bromide solution and the other contains calcium iodide solution.

A technician tests a sample of the liquid.

TestObservation
Add a few drops of sodium hydroxide solutionWhite precipitate forms
Add excess sodium hydroxide solutionWhite precipitate remains
a.

Explain why these results do not establish which pipe is leaking.

[2]
b.

Describe and explain how an additional chemical test on a fresh sample could identify which pipe is leaking. Include the result for each possible solution.

[4]
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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