Ferrous chloride
[CAS# 7758-94-3]

Identification

• Classification: Inorganic chemical industry >> Inorganic salt >> Metal halides and halides >> Metal chlorides and salts
• Name: Ferrous chloride
• Synonyms: Iron dichloride
• Molecular Formula: FeCl₂
• Molecular Weight: 126.75
• CAS Registry Number: 7758-94-3
• EC Number: 231-843-4
• SMILES: [Cl-].[Cl-].[Fe+2]

Properties

• Solubility: 62.6% w/w (water 20 ºC)
• Density: 3.16 g/mL (25 ºC)
• Melting point: 674 ºC
• Boiling point: 1026 ºC (760 mmHg)

Safety Data

• Hazard Symbols: GHS06;GHS07 Danger
• Hazard Statements: H302-H314
• Precautionary Statements: P280-P305+P351+P338-P310

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute toxicity	Acute Tox.	4	H302
Serious eye damage	Eye Dam.	1	H318
Substances or mixtures corrosive to metals	Met. Corr.	1	H290
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412
Skin irritation	Skin Irrit.	2	H315
Skin sensitization	Skin Sens.	1	H317
Skin corrosion	Skin Corr.	1B	H314
Eye irritation	Eye Irrit.	2	H319
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Acute toxicity	Acute Tox.	4	H332
Acute toxicity	Acute Tox.	4	H312

• Transport Information: UN 3260

Discovory and Applicatios

Ferrous chloride, with the chemical formula FeCl₂, is an important iron chloride compound used in various industrial and chemical processes. Its discovery and application span several fields, reflecting its versatility and utility.

The discovery of ferrous chloride dates back to the early 19th century, when it was first identified during studies on iron compounds and their reactions. It is typically produced by reacting iron with hydrochloric acid or through the reduction of ferric chloride with a suitable reducing agent. The compound is usually encountered as a greenish, crystalline solid or in solution, and it has distinct chemical and physical properties that make it valuable in different applications.

One of the primary uses of ferrous chloride is in water and wastewater treatment. In this context, it functions as a coagulant and flocculant, helping to remove suspended particles and impurities from water. By promoting the aggregation of particles into larger clumps, ferrous chloride aids in their subsequent removal through sedimentation or filtration. This application is essential for purifying drinking water and treating industrial effluents, contributing to cleaner and safer water resources.

In addition to its role in water treatment, ferrous chloride is used in various chemical synthesis processes. It serves as a reducing agent in organic reactions, facilitating the reduction of other compounds and enabling the formation of specific products. This property makes ferrous chloride valuable in the synthesis of pharmaceuticals and fine chemicals, where precise control over reaction conditions is required.

Ferrous chloride also finds applications in the production of pigments and dyes. It is used as a mordant in dyeing processes, where it helps fix dyes to fabrics and materials. This application is important in the textile industry, where ferrous chloride contributes to the creation of vibrant and long-lasting colors in textiles.

Handling ferrous chloride requires adherence to safety protocols due to its corrosive nature and potential health hazards. Proper personal protective equipment and working conditions are essential to avoid exposure and ensure safe use. Storage and handling procedures must be followed to maintain the compound's stability and prevent contamination.

Ongoing research continues to explore new applications and improve the efficiency of ferrous chloride in various fields. Advances in chemistry and environmental engineering are expected to enhance the compound's utility and lead to new innovations in its applications.

In summary, ferrous chloride is a significant chemical compound with diverse applications in water treatment, chemical synthesis, and pigment production. Its discovery and development have provided valuable tools for industrial and environmental processes, with ongoing research promising to expand its uses and improve its performance.

References

2015. Role of indigenous iron in improving sludge dewaterability through peroxidation. Scientific Reports, 5.
DOI: 10.1038/srep07516

2019. Phosphate-modified ferric-based material remediates lead and arsenic co-contaminated soil and enhances maize seedling growth. Environmental science and pollution research international, 27(5).
DOI: 10.1007/s11356-019-07356-4

2020. Urolithin A and B Derivatives as ON-OFF Selective Fluorescent Sensors for Iron(III). Journal of Fluorescence, 30(1).
DOI: 10.1007/s10895-019-02475-0