What is the role of H2SO4 in brown ring test?

Sulfuric acid is added slowly along the side of the test tube so that the sulfuric acid forms a layer just below the aqueous solution of nitrate which is already present in the test tube ,and the brown ring will be produced at the junction of the two liquids.

What happens when concentrated H2SO4 is added to benzene?

Explanation: Benzene when treated with concentrated nitric acid and sulfuric acid at 330K temperature it forms nitrobenzene that is nitration occurs. The reaction is highly explosive and risky as a lot of heat is evolved during the reaction.

Why is it necessary to add double volume of concentrated sulphuric acid in the brown ring?

The brown ring test is performed byputting iron(II) sulfate to a solution that contains nitrate ions. Concentrated sulphuric acid is added to a mixture of Iron(ii)sulphate and a suspected nitrate solution, the acid sinks to the bottom. This is because sulphuric acid is denser than the solution.

What happens when conc H2SO4 is added to carbon?

Sulfuric acid interacts with carbon to generate carbon dioxide and sulphur dioxide gas, as well as water. A concentrated, heated solution of sulfuric acid should be used.

What happens when freshly prepared ferrous sulphate solution is added to the mixture of conc nitric acid and conc sulphuric acid?

Ans- When FeSO4 is added to the well cooled mixture of dilute HNO3 and conc. H2SO4, it give brown ring of nitrous ferrous sulphate.

What happens when benzene is treated with conc H2SO4 at 373K?

Conc. HNO3 +Conc. H2SO4 (nitrating mixture) reacts with benzene to give nitrobenzene at 323Kand m-dinitrobenzene at 373K.

What happens when benzene is heated with conc H2SO4 at 250c?

Benzene on heating with conc. H2SO4 gives benzenesulphonic acid which when heated with superheated steam under pressure gives benzene.

When conc sulphuric acid is added slowly to a solution of ferrous sulphate containing nitrate ion a brown Colour ring is formed the composition of the ring is?

A brown ring wall from at the junction of the two layers ,indicting the presence of nitrate ion. The brown ring formed in the confirmatory test for the nitrate ion is due to the complex called nitros ferrous sulphate with the formula [Fe(H2O)5(NO)]SO4.

Which of the following substance gives carbon with conc H2SO4?

The concentrated sulphuric acid removes water from oxalic acid. So, heating of oxalic acid in presence of concentrated sulphuric acid produces carbon monoxide gas, carbon dioxide gas, and a water molecule.

When concentrated H2SO4 is added to dry kno3?

Concentrated sulphuric acid reacts with dry potassium nitrate to form nitric acid and potassium sulphate. The formed nitric acid dissociates to give nitrogen dioxide, water and oxygen gas. The gas formed by the reaction of concentrated sulphuric acid and dry potassium nitrate is nitrogen dioxide.

What happens when freshly prepared ferrous sulphate?

A freshly prepared ferrous sulphate solution is used because on exposure to the atmosphere, it is oxidized to ferric sulphate which will not give the brown ring.

Why is H2SO4 added slowly in the test tube?

This is why slow addition of the acid (through the sides of the test tube) is advised. brown ring formed due to a complex formed by reaction between Fe+2 and NO3- .complex is of formula [Fe (H2O)5NO]SO4 .The ring is unstable because Fe is present in +1 oxidation state thats why H2SO4 is added slowly because it can oxides Fe and can break the ring

How do you perform a brown ring test on nitrates?

Brown Ring Test Procedure: A common nitrate test is also known as the brown ring test. The experiment can be performed as follows: Step 1: Take the solution of nitrate. Step 2: Add iron(II) sulfate. Step 3: Slowly add concentrated sulphuric acid (H 2SO 4) such that the acid added forms a layer below the aqueous solution.

What is the result of brown ring test reaction?

Result – A ring brown in color will be formed at the junction of the 2 layers. This indicates the presence of nitrate ion. Brown Ring Test Reaction: The overall reaction is given below: Reduction of the nitrate ion, oxidation of iron(II) and reduction of nitric oxide. 2HNO 3 + 3H 2 SO 4 + 6FeSO 4 —>> 3Fe 2 (SO 4) 3 + 2NO + 4H 2 O

What happens when concentrated sulfuric acid is added to H2SO4?

The concentrated sulfuric acid decomposes this complex and brown ring disappers in a few seconds when H X 2 S O X 4 moves to the upper layer. This is why slow addition of the acid (through the sides of the test tube) is advised.