Chemistry
State how addition of nitric acid to acidified FeSO4, serves as a test for the former.
Nitric Acid
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Answer
When nitric acid is added to acidified FeSO4, conc. sulphuric acid being heavier settles down and the iron [II] sulphate layer remains above it resulting in the formation of the brown ring at the junction.
6FeSO4 + 3H2SO4 + 2HNO3 (dil. ) ⟶ 3Fe2(SO4)3 + 4H2O +2NO
FeSO4 + NO ⟶ FeSO4.NO
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