C

• Describe a test to show that the dinking water contained aluminium ions

  Give the result of the test.

  Add sodium hydroxide

  White precipitate forms
• Describe a test to show that the drinking water contained sulfate ions.

  Give the result of the test.

  Barium chloride and dilute hydrochloric acid

  white precipitate forms
• Plan an investigation to find the total mass of dissolved solids in a 100 cm sample of the drinking water.

  • Weigh an empty evaporating basin
  • Fill with a sample of the water and heat with a bunsen burner until all the water evaporates
  • Reweigh any salts left in the evaporating basin are calculate the mass of solids that were dissolved the sample