Question

In the ring test of `NO_(3)^(-)` ion, `Fe^(2+)` ion reduces nitrate ion to nitric oxide, which combines with `Fe^(2+)` (aq) ion to form brown complex .
Write the reactions involved in the formation of brown ring.

Answer 1

The chemical reactions involved are :
`NO_(3)^(-) (aq)+3Fe^(2+)(aq) +4H^(+)(aq) to NO(g) +3Fe^(3+)(aq)+2H_(2)O(l)`
`Fe^(2+)(aq)+NO(g) +5H_(2)O(l) to [Fe (H_(2)O)_(5)NO]^(2+) (aq)`