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8.3 Identification of ions by chemical and spectroscopic means

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Question 8

A manufacturer tests a cleaning solution for sulfate ions. A sample of the solution is acidified with dilute hydrochloric acid before barium chloride solution is added.

Why is the sample acidified with dilute hydrochloric acid?

[1]
A

It removes carbonate ions that could otherwise give a false positive result

B

It provides chloride ions that combine with sulfate ions in the precipitate

C

It increases the sulfate ion concentration so the positive result is clearer

D

It changes carbonate ions into sulfate ions before the barium chloride is added

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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