Iron(II) chloride

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Iron(II) chloride
Iron(II) chloride anhydrous by NurdRage.jpg
Anhydrous FeCl2
Names
IUPAC name
Iron(II) chloride
Other names
Ferrous chloride
Iron dichloride
Rokühnite
Properties
FeCl2
Molar mass 126.751 g/mol (anhydrous)
198.8102 g/mol (tetrahydrate)
Appearance White solid (anhydrous)
Green solid (hydrated)
Odor Odorless
Density 3.16 g/cm3 (anhydrous)
2.39 g/cm3 (dihydrate)
1.93 g/cm3 (tetrahydrate)
Melting point 677 °C (1,251 °F; 950 K) (anhydrous)
120 °C (248 °F; 393 K) (dihydrate)
105 °C (221 °F; 378 K) (tetrahydrate)
Boiling point 1,023 °C (1,873 °F; 1,296 K) (anhydrous)
64.4 g/100 ml (10 °C)
68.5 g/100ml (20 °C)
105.7 g/100 ml (100 °C)
Solubility Soluble in acetone, ethanol, methanol, THF
Slightly soluble in benzene, dioxane, toluene
Insoluble in chloroform, diethyl ether, pentane
Vapor pressure ~0 mmHg
Hazards
Safety data sheet Sigma-Aldrich (anhydrous)
Sigma-Aldrich (tetrahydrate)
Flash point Non-flammable
Related compounds
Related compounds
Iron(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Iron(II) chloride or ferrous chloride, is a salt of iron with the formula FeCl2.

It exists in nature as the rare mineral Rokühnite (FeCl2·2 H2O).

Properties

Chemical

Ferrous chloride will slowly oxidize in air to ferric oxide and ferric chloride.

Physical

Ferrous chloride is a white (anhydrous) or green (hydrated) solid, soluble in water.

Availability

Iron(II) chloride is sold by chemical suppliers.

Preparation

Ferrous chloride can be prepared by reacting hydrochloric acid with iron metal. If you want to obtain the solid form, you will have to dry it in the presence of excess iron, in low oxygen environment.

NurdRage has a procedure on making this compound.

Projects

  • Catalyst in organic chemistry
  • Grow beautiful crystals

Handling

Safety

Ferrous chloride is sensitive to air.

Storage

In air-tight containers.

Disposal

Should be mixed with a base, dried and dumped in trash or strongly diluted and poured down the drain.

References

Relevant Sciencemadness threads