Iron (ll) sulfate exist most commonly as heptahydrate form and it is highly soluble in water to produce the complex [Fe(H2O)6]2+, which has octahedral molecular geometry and is paramagnetic.
Ferrous sulfate monohydrate is obtained from a pickling solution containing ferrous chloride, hydrochloric acid and water and reacted in a precipitating reactor in the presence of excess sulfuric. Ferrous sulfate monohydrate is then converted in a crystallization reactor in the presence of water into ferrous sulfate heptahydrate as crystallized product. After which, water is isolated from the ferrous sulfate heptahydrate.
Ferrous sulfate is used to fortify foods and to treat iron-deficiency anaemia. Constipation is a frequent and uncomfortable side effect associated with the administration of oral iron supplements. Stool softeners often are prescribed to prevent constipation.
Dye and Textile Industry
Ferrous sulfate was used in the manufacture of inks, especially iron gall ink. It is also used in wool dyeing a mordant. There are two different methods for the direct application of indigo dye. One of these is known as china blue and involved iron(II) sulfate. After printing an insoluble form of indigo onto the fabric, the indigo was reduced to leuco-indigo in a sequence of baths of ferrous sulphate. Sometimes, it is included in canned black olives as an artificial colorant.
Iron (II) sulfate is sold as ferrous sulfate, a soil amendment for lowering the pH of a high alkaline soil so that plants can access the soil's nutrients.