Identification of Anions (CIE IGCSE Chemistry)
Revision Note
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Chemistry Lead
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
Exam 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.
If you are an extended level student you may be asked to write balanced ionic equations for cation and anions tests, so make sure you know the formulae of all the ions and precipitates formed.
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