Testing Water Purity

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  • Created by: Qiao-Chu
  • Created on: 14-04-13 15:08

Water companies test water regularly to ensure pollutant levels do not exceed limits. Can test for dissolved ions using precipitation reactions.

1. Test for sulphate ions using barium chloride:

  • Add dilute hydrochloric acid to test sample.
  • Add 10 drops of barium chloride solution.
  • If white precipitate, there are sulphate ions in sample.
  • Barium ions + sulphate ions --> barium sulphate
  • Ba2+ + SO42- --> BaSO4

Barium chloride + postassium…

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