Iron(III) chromate
Encyclopedia
Iron chromate is the iron
(III) salt of chromic acid
with the chemical formula
Fe2(CrO4)3.
in 1817 while visiting Shetland.
and iron(III) nitrate
. This reaction forms iron(III) chromate and potassium nitrate. It also can be formed by the oxidation by air of iron and chromium oxides in a basic environment:
Iron
Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...
(III) salt of chromic acid
Chromic acid
The term chromic acid is usually used for a mixture made by adding concentrated sulfuric acid to a dichromate, which may contain a variety of compounds, including solid chromium trioxide. This kind of chromic acid may be used as a cleaning mixture for glass. Chromic acid may also refer to the...
with the chemical formula
Chemical formula
A chemical formula or molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound....
Fe2(CrO4)3.
Discovery
Iron(III) chromate was discovered by Samuel Hibbert-WareSamuel Hibbert-Ware
Samuel Hibbert-Ware was an English geologist and antiquarian. Born in St Ann's Square, Manchester, he was the eldest son of Samuel Hibbert, a linen yarn merchant, and his wife Sarah....
in 1817 while visiting Shetland.
Production
It may be formed by the reaction of potassium chromatePotassium chromate
Potassium chromate is a yellow chemical indicator used for identifying concentrations of chloride ions in a salt solution with silver nitrate...
and iron(III) nitrate
Iron(III) nitrate
Iron nitrate, or ferric nitrate, is the chemical compound with the formula Fe3. Since it is deliquescent, it is commonly found in its nonahydrate form Fe3·9H2O in which it forms colourless to pale violet crystals.-Preparation:...
. This reaction forms iron(III) chromate and potassium nitrate. It also can be formed by the oxidation by air of iron and chromium oxides in a basic environment:
- 4 Fe2O3 + 6 Cr2O3 + 9 O2 → 4 Fe2(CrO4)3