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Identification of Anions (Cambridge O Level Chemistry)
Revision Note
Identification of Anions
- The acidification with aqueous silver nitrate and aqueous barium nitrate / chloride is done to remove ions that might give a false positive result
- The most common ion that is removed is the carbonate ion
- The choice of acid has to be considered so that it does not influence the results
- For example, aqueous silver nitrate solution should not be acidified with hydrochloric acid as this will form a white precipitate due to the chloride ion in the acid
- For example, aqueous barium nitrate / chloride solution should not be acidified with sulfuric acid as this will form a white precipitate due to the sulfate ion in the acid
Examiner Tip
When it comes to qualitative inorganic analysis, always remember that there will be a test for the metal cation part of the molecule and another test for the anion part.
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