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Question

What is the brown ring in a brown ring test?


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Solution

Brown ring test

  • The presence of nitrate ions in a sample is detected using the brown ring test.
  • The test is commonly performed by mixing a dilute ferrous sulfate solution with an aqueous solution containing nitrate ion, then carefully pouring strong sulphuric acid along the sides of the test tube.
  • The presence of nitrate ions in the solution is shown by a brown ring at the interface between the solution and the sulphuric acid layers.

Reaction for this test

  • The reaction is as follows:-

NO3-+3Fe2++4H+NO+3Fe3++2H2OFeH2O62++NOFeH2O5NO2++H2Obrown


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