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8.3 Identification of ions by chemical and spectroscopic means

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Question 18

A laboratory compares two procedures for testing solutions.

Reference solution P contains no sulfate ions. Reference solution Q contains sulfate ions. Solution R is an unknown solution.

ProcedureAcid added before barium chloride solutionResult with PResult with QResult with R
1dilute hydrochloric acidno precipitatewhite precipitatewhite precipitate
2dilute sulfuric acidwhite precipitatewhite precipitatewhite precipitate
a.

Explain why Procedure 2 produces a white precipitate with reference solution P.

[2]
b.

Suggest whether solution R contains sulfate ions. Use the results to justify your answer.

[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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