Fe2+ ions react with nitric oxide formed from reduction of nitrate and yields a brown coloured complex _____________.

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[ Fe(H2O)5NO ]2+ An aqueous salt solution containing nitrate ion is mixed with ferrous sulphate and sulphuric acid solution. First nitric oxide is formed. NaNO3 + H2SO4 → NaHSO4 + HNO3 6FeSO4 + 3H2SO4 + 2HNO3 → 3Fe2(SO4)3 + 4H2O + 2NO Fe2+ ions react with nitric oxide formed from reduction of nitrate and yields a brown coloured complex [Fe(H2O)5NO]2+ Thus, one mole of ferrous sulphate reacts with one mole of nitric oxide and five moles of water to form the complex [Fe(H2O)5NO]2+ The balanced chemical reaction is shown below. FeSO4 + NO + 5H2O → [ Fe(H2O)5NO]SO4 This reaction is used for the detection of nitrate ion in the ring test.

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