Iron (III) hydroxide is the chemical compound, i m sorry is made of hydrogen, Iron, and also oxygen having actually the chemical formula Fe(OH)3. Based upon the hydration, decision structure, and also particle size and also shape, the colour of the stole III hydroxides different from dark-brown come black. Below we will study the iron III hydroxide formula, that is properties, chemistry structure and uses. Ferric hydroxide formula is also Fe(OH)3.

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Iron III Hydroxide Properties

Chemical Name

Iron III Hydroxide

Other names

Ferric acid

Iron hydroxide formula or formula that ferric hydroxide


Melting Point

135 °C

Molar Mass

106.867 g/mol


4.25 g/cm³


Vivid dark orange crystals

Solubility in Water


Let united state look at the other properties below.

The colour of stole (III) oxyhydroxide varieties from yellow v dark-brown to black, based upon the level of hydration, fragment shape, and size, and crystal structure.


The crystal structure of β-FeOOH (also referred to as akaganeite) is that of BaMn8O16 or hollandite. The unit cabinet is tetragonal, having actually a=1.048 and c=0.3023 nm, and holds 8 formula systems of FeOOH. That dimensions are up come 500 × 50 × 50 nm. Often, twinning to produce particles having the form of hexagonal stars.


On heating Iron III Hydroxide, β-FeOOH decomposes and recrystallizes together α-Fe2O3 (which is referred to as hematite).

Natural Occurrences

Anhydrous ferric hydroxide takes location in nature as the exceedingly rare mineral bernalite, Fe(OH)3·nH2O (n=0.0-0.25). Iron oxyhydroxides are additionally called FeOOH. They are an ext common and also take location naturally as structurally various minerals (or polymorphs) and also are denoted through the Greek letter α, β, γ, and also δ.

Goethite v the chemical formula - α-FeO(OH) has actually been offered as the ocher pigment because prehistoric times.

Feroxyhyte (δ) deserve to be formed under the high-pressure problems of the ocean and sea floors, being thermodynamically unstable with respect come the α-polymorph (or goethite) in ~ the surface ar conditions.


Limonite, which is a mixture of various polymorphs and also hydrates that ferric oxyhydroxide, is one of the three primary iron ores, having been used due to the fact that 2500 BC, at least.

Yellow steel oxide, otherwise referred to as Pigment Yellow 42, is the Food and also Drug administration - FDA authorized for the usage in cosmetics and also can be supplied in a couple of tattoo inks.

Also, stole oxide-hydroxide can be provided in aquarium water treatment as a phosphate binder.

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The nanoparticles of iron oxide-hydroxide have actually been studied as possible adsorbents because that the remove of command from aquatic media.