Iron(II) sulfide

Iron sulphide Iron monosulfide

Dark gray or black, metal-like pieces, plates or rods

Fixed

4.84 g · cm -3

1195 ° C

Practically insoluble in water

Attention

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Properties

Iron (II ) sulfide is insoluble in water. With acids, it reacts to form hydrogen sulfide:

On heating to a higher temperature at 138 ° C and 325 ° C. in each case a crystallographic transformation in the solid state. Pure iron (II ) sulfide is light brown crystals of Nickelarsenid type. The technical product is usually colored by residual iron dark to black.

Production

Both in the laboratory and technically can be iron (II ) sulphide prepared by briefly heating a mixture of iron powder and sulfur powder in an exothermic reaction:

Occurrence

In nature there is iron (II ) sulfide as pyrrhotite, troilite and mackinawite.

Bacterial anaerobic corrosion can be seen, which is produced as a final product by the blackening of iron (II ) sulphide. This archaic bacterial metabolism plays in the iron-sulfur world, a scenario for the early evolution of life, an important role.

The green color of egg yolk comes from after prolonged cooking ( more than 10 minutes ) formed - harmless - iron sulfide.

Use

Iron (II ) sulfide was used previously for the synthesis of sulfuric acid. In this case, the iron (II ) sulfide was roasted under the supply of air, the sulfur dioxide needed for the further synthesis was formed. In the laboratory can iron (II ) sulfide are used for producing hydrogen sulfide.