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Introduction to Halides | Chemistry for Grade 10 PDF Download

Silver Nitrate Test

  • Acidify the sample with dilute nitric acid (HNO3) followed by the addition of silver nitrate solution, AgNO3
  • The acidification is done to remove carbonate ions that might give a false positive result
  • If a halide is present it forms a silver halide precipitate:
    Introduction to Halides | Chemistry for Grade 10
  • Depending on the halide present, a different coloured precipitate is formed, allowing for identification of the halide ion
  • Silver chloride is white, silver bromide is cream and silver iodide is yellow

Each silver halide produces a precipitate of a different colourEach silver halide produces a precipitate of a different colour

Exam Tip

The acidification step in the halide ion test must be done with nitric acid rather than hydrochloric acid, as HCl contains chloride ions which would interfere with the results.

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