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8.3 Identification of ions by chemical and spectroscopic means

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Question 5

A technician tests water from a glass-manufacturing process. An earlier test shows that the water contains carbonate ions. The technician tests two portions of the water for halide ions.

ProcedureMethodObservation
AAdd dilute nitric acid, then add silver nitrate solutionNo precipitate forms
BAdd silver nitrate solution without adding dilute nitric acidA precipitate forms

Explain why the two procedures give different results and conclude whether the water contains halide ions.

[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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