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Author: Subject: Restoring Oxidised FeSO4
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[*] posted on 10-4-2017 at 05:50
Restoring Oxidised FeSO4

So I kept most of my chemicals after moving untouched for about 5 years now, and discovered my iron sulfate turned to this gunk:

20170410_164307.jpg - 3MB 20170410_164313.jpg - 2.9MB

The FeSO4 was prepared from battery electrolyte sulfuric acid and nails.

Honestly, I didn't know that it is not stable in air
from wikipedia: Upon exposure to air, it oxidizes to form a corrosive brown-yellow coating of "basic ferric sulfate", which is an adduct of iron(III) oxide and iron(III) sulfate:

12 FeSO4 + 3 O2 → 4 Fe2(SO4)3 + 2 Fe2O3

my question is what should I do to turn it back to pure ferrous sulfate?
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[*] posted on 10-4-2017 at 06:35

Recrystallize in a slightly acid solution, maybe?

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[*] posted on 10-4-2017 at 07:26

Dissolve it in water (it will be cloudy) and then add sulfuric acid dropwise until the solution goes clear. Add a generous excess iron to the solution, and allow the iron to react until the yellow color has disappeared. Stir it well to make sure all of the solution is reduced. Then just filter off the excess iron and recrystallize it. Make sure that it's completely dry when you store it, as water will accelerate the oxidation a lot. Store it in an airtight container, densely packed together to try and exclude as much air as possible.

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