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Iron(III) chromate

Iron(III) chromate is the iron(III) salt of chromic acid with the chemical formula Fe<sub>2</sub>(CrO<sub>4</sub>)<sub>3</sub>.

Discovery

Iron(III) chromate was discovered by Samuel Hibbert-Ware in 1817 while visiting Shetland.

Production

It may be formed by the salt metathesis reaction of potassium chromate and iron(III) nitrate, which gives potassium nitrate as byproduct.

2 Fe(NO<sub>3</sub>)<sub>3</sub> + 3 K<sub>2</sub>CrO<sub>4</sub> → Fe<sub>2</sub>(CrO<sub>4</sub>)3 + 6 KNO<sub>3</sub>

It also can be formed by the oxidation by air of iron and chromium oxides in a basic environment:

4 Fe<sub>2</sub>O<sub>3</sub> + 6 Cr<sub>2</sub>O<sub>3</sub> + 9 O<sub>2</sub> → 4 Fe<sub>2</sub>(CrO<sub>4</sub>)<sub>3</sub>

References