What is Ferrous sulphate?
Ferrous sulphate is salt of iron also known as Ferrous sulphate (Green vitriol), It is commonly known as hara Kasis.
The formula of Ferrous sulphate
The formula of ferrous sulphate is
Ferrous sulphate (Green vitriol), FeSO4.7H2O
Preparation of Ferrous Sulphate
- By dissolving scrap Fe in dil. H2SO4
- From Kipp’s waste, which contains ferrous sulphate with some free H2SO4, the latter is neutralised with scrap iron, forming FeSO4 and hydrogen.
- By the action of air and water on iron pyrites. The solution is treated with scrap iron to remove H2SO4 and to reduce Fe3+ sulphate Fe2+ sulphate.
Properties of Ferrous Sulphate
- Hydrated and anhydrous FeSO4 are green and white in colour, respectively. It is isomorphous with epsom salt, MgSO4.7H2O and ZnSO4.7H2O. It effervesces on exposure to air.
- Light green crystals of FeSO4 lose water and turn brown on exposure to air, due to oxidation.
- On heating at 300C it gives anhydrous FeSO4 which on further heating gives Fe2O3 and SO2.
- Like other ferrous salts, it takes up HNO3 forming brown coloured double compound, Fe(NO)SO4, nitroso ferrous sulphate (Ring test for nitrates).
- It decolourises acidified potassium permanganate and turns acidified dichromate green (reducing character).
- It forms double salts with the sulphates of alkali metals with the general formula R2SO4.FeSO4.6H2O. With ammonium sulphate, it forms a double salt known as ferrous ammonium sulphate or Mohr’s salt, FeSO4.(NH4)2SO4.6H2O. It does not effervesce. It ionises in solution to give Fe 2+, NH 4+ and SO4 2- ions.
Uses of Ferrous Sulfate
Ferrous Sulfate (FeSO₄), also known as iron(II) sulfate, is an important iron-containing compound widely used in medicine, agriculture, water treatment, and industry. It appears as a pale green crystalline solid and is one of the most common iron supplements.
1. Treatment of Iron Deficiency Anaemia
The most important use of ferrous sulfate is as an iron supplement for treating and preventing iron deficiency anaemia. It helps increase haemoglobin production and improves the oxygen-carrying capacity of blood.
2. Agricultural Fertiliser
Ferrous sulfate is used as a micronutrient fertiliser to correct iron deficiency in plants. It helps improve chlorophyll production, resulting in healthier green leaves and better crop growth.
3. Soil Conditioner
In alkaline soils, ferrous sulfate is added to lower the soil pH and make nutrients more available to plants. It is commonly used in lawns, gardens, and agricultural fields.
4. Water Treatment
Ferrous sulfate is used in water and wastewater treatment plants to remove impurities, reduce phosphorus levels, and improve water quality through coagulation and flocculation processes.
5. Industrial Applications
It is used in the manufacture of iron pigments, inks, dyes, and other chemical products. It also serves as a reducing agent in various industrial reactions.
6. Cement and Construction Industry
Ferrous sulfate is added to cement to reduce the concentration of toxic chromium(VI) compounds, making cement safer for workers handling construction materials.
7. Sewage Treatment
In sewage treatment systems, ferrous sulfate helps control unpleasant odors by reacting with sulfur-containing compounds and reducing hydrogen sulfide formation.
8. Moss Control
It is commonly applied to lawns and gardens to control moss growth while promoting healthy grass development.
Conclusion
Ferrous sulfate is a versatile compound with applications in healthcare, agriculture, water purification, construction, and industrial manufacturing. Its role as an iron supplement and plant nutrient makes it especially valuable in improving both human health and agricultural productivity.
FAQs on Ferrous sulphate
Ferrous sulphate is a chemical compound containing iron, sulfur, and oxygen, commonly represented by the formula FeSO₄. It is usually found as a pale green or blue-green crystalline solid and is one of the most widely used iron salts. Ferrous sulphate is valued for its high iron content and is used in a variety of industries, including agriculture, water treatment, and manufacturing. It is also commonly used to correct iron deficiencies in plants and humans. Due to its effectiveness and affordability, ferrous sulphate remains an important compound in both industrial and agricultural applications around the world.
Ferrous sulphate has numerous applications across different sectors. In agriculture, it is used as a fertilizer and soil amendment to treat iron deficiency in crops and improve plant growth. In water treatment facilities, it helps remove impurities and reduce contaminants. It is also used in the production of pigments, inks, and certain chemical compounds. Additionally, ferrous sulphate plays a role in textile processing and leather manufacturing. Because of its ability to provide a readily available source of iron, it is widely used wherever iron supplementation or iron-based chemical reactions are required.
Ferrous sulphate is highly beneficial in agriculture because it supplies iron, an essential nutrient required for healthy plant development. Iron helps plants produce chlorophyll, which is necessary for photosynthesis and overall growth. When plants lack sufficient iron, they may develop yellow leaves and show signs of poor growth. Applying ferrous sulphate to the soil or as a foliar spray can help correct these deficiencies and restore plant health. It is also used to improve soil quality in alkaline conditions where iron availability is limited. Farmers often rely on ferrous sulphate to enhance crop productivity and maintain healthy fields.
Ferrous sulphate typically appears as greenish-blue crystals and is highly soluble in water. It is commonly available in hydrated forms, meaning it contains water molecules within its crystal structure. When exposed to air for extended periods, ferrous sulphate may oxidize and gradually change color due to the formation of ferric compounds. The compound has a slightly acidic nature when dissolved in water and is relatively stable when stored properly in dry conditions. Its combination of good solubility, iron content, and chemical reactivity makes ferrous sulphate useful for a wide range of industrial, agricultural, and environmental applications.