February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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39Water Chemistry Water TreatmentMedium1 mark
Two test-tubes each contain a sample of water. One test-tube contains pure water, but the other test-tube contains water and dissolved sodium chloride as an impurity. Which tests may be used to identify the test-tube that contains pure water?
  1. 1
    Measure the boiling point of each water sample.
  2. 2
    Test each sample with acidified aqueous silver nitrate.
  3. 3
    Test each sample with anhydrous copper(II) sulfate.