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Ferrous Fumarate: Key Chemical Properties and Applications

Ferrous fumarate is an iron supplement widely used in pharmaceuticals and food fortification due to its high bioavailability and stability. Understanding its chemical properties is essential for optimizing its applications.

Chemical Composition and Structure
Ferrous fumarate (C₄H₂FeO₄) is an iron(II) salt of fumaric acid. It consists of ferrous ions (Fe²⁺) bonded to fumarate anions, forming a reddish-brown or orange powder. Its molecular weight is 169.9 g/mol, and it has a low solubility in water but dissolves well in dilute acids.

Stability and Reactivity
Ferrous fumarate is relatively stable under normal conditions but can oxidize in moist environments, converting to ferric (Fe³⁺) compounds. It is sensitive to light and heat, requiring storage in airtight, dark containers to prevent degradation.

Solubility and pH Sensitivity
This compound is poorly soluble in water (0.14 g/100 mL at 25°C) but dissolves better in acidic solutions, making it ideal for gastric absorption. Its bioavailability increases in low-pH environments, such as the stomach.

Applications in Industry and Medicine
Due to its high iron content (about 33%), ferrous fumarate is a preferred choice for treating iron-deficiency anemia. It is also used in food fortification, such as in cereals and flour, to enhance nutritional value.

Conclusion
Ferrous fumarate’s unique chemical properties—including stability, iron content, and pH-dependent solubility—make it a valuable compound in healthcare and food industries. Proper storage and handling ensure its effectiveness in various applications.