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4.2 Identifying the products of chemical reactions

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Question 1

A technician analyses a solution from a metal-treatment process. The solution contains either iron(II) ions or iron(III) ions.

The technician adds a few drops of sodium hydroxide solution to a portion of the solution. The technician does not examine the result until 10 minutes later, when the surface of the precipitate is orange-brown.

The technician concludes that the solution contains iron(III) ions.

Evaluate the technician's conclusion. Suggest how the technician should change the procedure, without using a different reagent, to identify the ion reliably.

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Markscheme

4.2 Identifying the products of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Identifying the products of chemical reactions

107 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.

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