18624-44-7 Usage
Chemical Properties
Different sources of media describe the Chemical Properties of 18624-44-7 differently. You can refer to the following data:
1. white, amorphous powder(s) or white to pale green, hexagonal crystal(s); oxidizes in air [MER06]
2. Iron(II) hydroxide is formed as a white flocculent precipitate when iron(II) salts
are treated with alkali under air-free conditions. In the presence of air it rapidly darkens to
a dark green and thence to an almost black colour; at this stage iron(II) and iron(III) are
both present in the precipitate. With excess of oxygen the red-brown iron(III) hydrous
oxide is formed. Ammonia incompletely precipitates iron(II) hydroxide due, at least in part,
to the formation of iron(II) ammonia complexes.
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.
Check Digit Verification of cas no
The CAS Registry Mumber 18624-44-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,6,2 and 4 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 18624-44:
(7*1)+(6*8)+(5*6)+(4*2)+(3*4)+(2*4)+(1*4)=117
117 % 10 = 7
So 18624-44-7 is a valid CAS Registry Number.
InChI:InChI=1/Fe.2H2O/h;2*1H2/q+2;;/p-2/rFeH2O2/c2-1-3/h2-3H
