Chemistry - Salt Analysis Question with Solution | TestHub

The brown ring test for nitrate ($N{O}_3^{-}$) involves mixing an aqueous solution of the salt with freshly prepared ferrous sulfate ($FeS{O}_4$) solution. Concentrated sulfuric acid ($H_{2}S{O}_4$) is then added carefully along the sides of the test tube, forming a brown ring at the junction of the two layers. This confirms the presence of nitrate ions.