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Qualitative analysis: tests for ions

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Question 11

A student tests a solid chemical sample to see if it contains sulfate ions (SO42−\text{SO}_4^{2-}SO42−​).

The student uses the following method:

  • Step 1: Dissolve a small amount of the solid in distilled water.
  • Step 2: Add a few drops of dilute sulfuric acid.
  • Step 3: Add a few drops of barium chloride solution.
  • Step 4: Observe whether a white precipitate forms.

This method to show whether the solid contains sulfate ions will not work.

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