Question

Explain brown ring test with the help of chemical equation

Answer 1

The bromine test is a qualitative test for the presence of unsaturated C=C bonds. In this test an unknown sample is treated with a small amount of elemental bromine — as an aqueous solution. A test for the presence of unsaturation is indicated by the disappearance of the deep brown coloration of bromine, which happens because the bromine has been consumed by reaction with the unknown sample.

Answer 2

Hello

This test is an identification test of NO₃⁻ ( nitrate).

Step 1 : Take the sample and add Conc. H₂SO₄ with constant shaking .

              KNO₃ + H₂S0₄=====⇒ KHSO₄ + HNO₃

Step 2: Heat it using bunsen burner .

Step 3 : Add freshly prepared FeSO₄.

            HNO₃ + FeSO₄ ===========⇒ NO + Fe₂(SO₄)₃ + H₂O

This rection produces nascent Oxygen [O].Nextly, FeSO₄ in            aqueous solution of course exist as [Fe(H₂O)₆]SO₄, It reacts with NO .

           [Fe(H₂O)₅]SO₄ + NO =============> [Fe(NO)(H₂O)₅]SO₄

                                                                        (BROWN COLOR)

Observation : Floating  Brown ring.

Inference : NO₃⁻  present.

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