Class 12 Chemistry P Block Elements Test for nitrates

Test for nitrates

It is also called as brown ring test.

 In this we take test tube and sample (salt containing nitrate) to it.

  • Then slowly pour concentrated sulphuric acid to it.
  • Then we put solution of ferrous sulphate and allow it to stand.
  • Then on interface a brown ring is formed that shows the presence of nitrates.
  • The ring that is formed is chemically [Fe(H2O)5(NO)]2+(Nitroso ferrous sulphate ).

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