Question

What happens when ozone is passed in an acidified solution of ferrous sulphate?

Answer 1

When ozone is passed in an acidified solution of ferrous sulphate, it is oxidised to ferric sulphate.

\[\ce{\phantom{....................}O3 -> O2 + [O]}\]

\[\ce{2FeSO4 + H2SO4 + [O] -> Fe2(SO4)3 + H2O}\]
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\[\ce{2FeSO4 + H2SO4 + O3 -> Fe2(SO4)3 + H2O + O2}\]