In the ring test of NO 3 – ion, Fe 2+ ion reduces nitrate ion to nitric oxide, which combines with Fe 2+ (aq.) ions to form brown complex. Write reactions involved in the formation of a brown ring.

Question

Philoid · Accepted Answer

Ring test is used to detect the presence of nitrate ions (NO₃^-) in chemistry qualitative analysis. The required chemical reactions involved for the Ring test' is:

i) NO₃^- + conc.H₂SO₄→ HSO₄^- + HNO₃

ii) 2HNO₃→ 2NO + H₂O + 3O

iii) 6FeSO₄ + 3O+ 3H₂SO ₄→ 3Fe₂(SO₄)₃ + 3H₂O

iv) 6FeSO₄ + 2HNO₃ + 3H₂SO₄ → 3Fe₂(SO₄)₃ + 2NO +4H₂O

v) FeSO₄ + NO + 5H₂O →

Brown ring is formed at the junction of the layers of the solution and sulphuric acid is obtained, which confirms the presence of nitrate ions in the solution.

In the ring test of NO3– ion, Fe2+ ion reduces nitrate ion to nitric oxide, which combines with Fe2+ (aq.) ions to form brown complex. Write reactions involved in the formation of a brown ring.

In the ring test of NO₃^– ion, Fe²⁺ ion reduces nitrate ion to nitric oxide, which combines with Fe²⁺ (aq.) ions to form brown complex. Write reactions involved in the formation of a brown ring.