Brown Ring Test -Confirmatory test of Nitrate Ion (NO3-)
Add freshly prepared FeSO4 solution into the salt solution then add Concentrated Sulphuric Acid from the wall of the tilted test tube. At the junction Brown Colour Ring is formed. Brown Ring Test Reactions Following reactions take place during brown ring test 2HNO3 + 3H2SO4 + 6FeSO4 → 3Fe2(SO4)3 + 2NO + 4H2O[Fe(H2O)6]SO4 + NO → [Fe(H2O)5(NO)]SO4 + H2O is given as a nitrosyl complex. Applications of Brown Ring Test: Brown ring test is mainly used for the detection of nitrate. It is used to detect the presence of nitrate in many food samples, soil, and water. As high quantities of nitrate in food cause food poisoning and high quantities of nitrate in the soil make it very acidic, which is harmful to plants and farming. If nitrate compounds are present in water more than 10 milligrams per litre, then it's not drinkable.
Add freshly prepared FeSO4 solution into the salt solution then add Concentrated Sulphuric Acid from the wall of the tilted test tube. At the junction Brown Colour Ring is formed. Brown Ring Test Reactions Following reactions take place during brown ring test 2HNO3 + 3H2SO4 + 6FeSO4 → 3Fe2(SO4)3 + 2NO + 4H2O[Fe(H2O)6]SO4 + NO → [Fe(H2O)5(NO)]SO4 + H2O is given as a nitrosyl complex. Applications of Brown Ring Test: Brown ring test is mainly used for the detection of nitrate. It is used to detect the presence of nitrate in many food samples, soil, and water. As high quantities of nitrate in food cause food poisoning and high quantities of nitrate in the soil make it very acidic, which is harmful to plants and farming. If nitrate compounds are present in water more than 10 milligrams per litre, then it's not drinkable.