Question

What is the concentration of ferrous sulphate during brown ring test?

Answer 1

#BAL

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. This reaction is exothermic, a brown ring is formed at the junction of the two layers. The brown ring is due to the formation of iron(ii) suplhate - nitrogen (ii) Complex, FeSO4.NO or Nitroso iron(ii) complex. There is no place for NO2,