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Industrial uses

The iron compounds produced on the largest scale in industry are iron(II) sulfate (FeSO ·7 H O) and iron(III) chloride (FeCl). The former is one of the most readily available sources of iron(II), but is less stable to aerial oxidation than Mohr's salt ((NH) Fe(SO) · 6H O). Iron(II) compounds tend to be oxidized to iron(III) compounds in the air.