| Identification | Back Directory | [Name]
iron dihydroxide | [CAS]
18624-44-7 | [Synonyms]
iron dihydroxide
FERROUS-HYDROXIDE
IRON(II)HYDROXIDE
Iron(II)dihydoxide
Iron hydroxide (Fe(OH)2) | [EINECS(EC#)]
242-456-5 | [Molecular Formula]
FeH2O2 | [MOL File]
18624-44-7.mol | [Molecular Weight]
89.8597 |
| Chemical Properties | Back Directory | [Melting point ]
decomposes [CRC10] | [density ]
3.400 | [form ]
white-green hexagonal crystals | [color ]
white-green hexagonal, hexane crystals, crystalline | [PH]
9.45(1 mM solution);9.45(10 mM solution);9.45(100 mM solution) | [Water Solubility ]
0.00015g/100mL H2O (18°C) [CRC10] | [Solubility Product Constant (Ksp)]
pKsp: 16.31 | [EPA Substance Registry System]
Iron hydroxide (Fe(OH)2) (18624-44-7) |
| Hazard Information | Back Directory | [Chemical Properties]
white, amorphous powder(s) or white to pale green, hexagonal crystal(s); oxidizes in air [MER06] | [Physical properties]
Pale green hexagonal crystals (in partially oxidized form) or white amorphous powder (when pure); density 3.4g/cm3; decomposes on heating; insoluble in water (1.5 mg/L at 20°C), KSP 8.0 x 10-16; soluble in acids; moderately soluble in ammonium salt solutions; insoluble in alkalies. | [Uses]
The compound is used in abrasives; and in pharmaceutical applications. | [Preparation]
Iron(II) hydroxide may be prepared by precipitation of an iron(II) salt solution with caustic soda or caustic potash in the absence of air. Pure compound may be obtained by mixing solutions of caustic potash and iron(II) sulfate— both the solutions made in freshly boiled water—in a reducing atmosphere of hydrogen:
Fe2+ + 2OHˉ → Fe(OH)2
. | [Structure and conformation]
Iron(II) hydroxide crystallizes with the CdI2 layer structure in which every iron atom is
surrounded by six OH groups. |
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