# Can concentrated sulfuric acid oxidize iron(II) to iron(III)?

Can concentrated (18 M) $$\ce{H2SO4}$$ oxidize $$\ce{Fe^2+}$$ to $$\ce{Fe^3+}?$$ Or does it actually block the oxidation? I read in some forum somewhere that in order to prevent $$\ce{Fe^2+}$$ from being oxidized, one should acidify the solution. I don't know if that's the reason why we added $$\ce{H2SO4}$$ in our $$\ce{Fe^2+}$$ solution. But then again, isn't iron(II) unstable in the presence of acid and water? And will it oxidize?

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• Which reaction are you talking about, i.e. what is the oxidation agent? Sulfuric acid is usually not classified as oxidizing acid (nitric acid, in contrast, is). – Karsten Theis Sep 28 '19 at 18:57