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Qualitative analysis: tests for ions

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Question 53

An analytical chemist is testing an unknown crystalline sample to determine if it contains iodide ions (I−\text{I}^-I−).

The chemist uses the following experimental procedure:

  • Step 1: Dissolve a spatula measure of the sample in deionised water.
  • Step 2: Add a few drops of dilute hydrochloric acid.
  • Step 3: Add a few drops of silver nitrate solution.
  • Step 4: Observe the colour of the precipitate that forms.

This method will not reliably show whether the sample contains iodide ions.

Explain a change that needs to be made to Step 2 to allow this method to work.

[2]

Qualitative analysis: tests for ions Questions

  1. GCSE
  2. /Chemistry
  3. /Qualitative analysis: tests for ions

Practise Edexcel GCSE Chemistry Qualitative analysis: tests for ions with exam-style questions for Foundation and Higher tier. 127 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank