Iron(III) sulfate

Colorless and odorless, hygroscopic, moisture and light sensitive powder

Fixed

• 3.10 g · cm -3 (anhydrous )
• 2.1 g · cm -3 ( nonahydrate )

480 ° C (decomposition to sulfur and iron oxides ) Elimination of water of crystallization of the Nonahydrates at 175 ° C.

Very well in water ( 4.400 g · l -1)

Attention

500 mg · kg -1 ( LD50, rat, oral)

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Iron (III ) sulfate is a chemical compound selected from the group of sulfates.

Occurrence

Iron (III ) sulfate is present as a waste product of the chemical industry. Furthermore, it comes as Coquimbit ( nonahydrate ) or Quenstedtit ( decahydrate ) as a secondary mineral before.

Production and representation

Iron (II) sulphate monohydrate FeSO4 · H2O decomposes upon strong heating from about 400 ° C to basic iron ( III) sulfate and sulfur dioxide. It is also produced by the decomposition of iron (II ) sulfate heptahydrate FeSO4 · 7 H2O in air, which is very fast and water delivery and oxidation. Large technical iron ( III) sulphate by the addition of sulfuric acid and an oxidizing agent (for example, nitric acid or hydrogen peroxide) to a hot iron ( II) sulfate solution is obtained.

Properties

Iron ( III) sulphate is formed with alkali metal or ammonium sulfate Eisenalaune, such as iron (III) ammonium alum (NH4) Fe (SO4) 2.12 H2O, which is used in the argentometry as an indicator.

Use

Iron ( III) sulphate is used for the precipitation of phosphates in large sewage treatment plants and as a mordant (for example, aluminum and steel). In medicine, a styptic and astringent effect is known.