Identifying Anions - Carbonate

  1. In form 4 chapter 7, Acids and Bases, you should have learned that the carbonate salts react with acid produce carbon dioxide and water. This chemical property of carbonate is used to test the presence of carbonate in a salt.
    CO32– + 2H+ → H2O + CO2
  2. During the test, some dilute hydrochloric acid / nitric acid /sulphuric acid is added to the carbonate salt.
  3. If the salt contain carbonate, effervescence occurs.
  4. If the gas given off is passed through lime water, the lime water will turns chalky.
  5. This indicates that the gas is carbon dioxide, and hence the salt contain carbonate.

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