Heptadrate Iron Sulphate, chemical formula FeSO4-7 H2O. Iron sulphate has several applications, mainly as an EC fertiliser, but also in nutrition. It is also used as a colouring agent, especially for concrete to give a rust colour. In horticulture as a lawn conditioner, or in the colouring of wool.
IDENTIFICATION AND PROPERTIES
Name: Iron sulphate
Synonyms: Ferrous sulphate, Iron (II) tetraoxosulphate (VI), Vitriol green, Vitriol iron, Caparose green.
Chemical formula: FeSO4-7 H2O
Composition: >90% iron sulphate heptahydrate
- Appearance: Crystalline Solid
- Colour: Blue-green
- Odour: Odourless
- pH: 4.6 (10%)
- Melting point: at 60ºC there is a partial loss of water ºC
- Boiling point/boiling range: at 300°C, dehydration occurs.
- Relative density: 2.97
- Water solubility: >100 g/l (20ºC, pH 3.7)
- Decomposition temperature: >300ºC
- Explosive properties: Non-explosive
- Oxidising properties: not oxidising
USES OF IRON SULPHATE
Iron sulphate has several uses. It is especially used in agriculture to lower the pH of the soil and thus release micronutrients that may have become trapped, insolubilised. It is also widely used to stain concrete surfaces, giving them a reddish or rusty appearance. You can see more in this section: Uses of Iron Sulphate