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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 in various industries.

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 solubility of 0.14 g/100 mL in water at 25°C, making it less soluble than other iron salts but more stable in acidic environments.

Stability and Reactivity
Ferrous fumarate is stable under dry conditions but can oxidize in moist environments, converting ferrous iron (Fe²⁺) to ferric iron (Fe³⁺). It decomposes at high temperatures (above 280°C) without melting. The compound is sensitive to light and air, requiring storage in airtight, opaque containers to prevent degradation.

pH Sensitivity
It is most stable in acidic conditions (pH 2–4), which enhances iron absorption in the gastrointestinal tract. In alkaline environments, it may form insoluble hydroxides, reducing bioavailability.

Applications in Pharmaceuticals and Nutrition
Due to its high iron content (~33% elemental iron) and low toxicity, ferrous fumarate is a preferred ingredient in iron supplements and fortified foods. Its slow oxidation rate ensures better shelf life compared to ferrous sulfate.

Conclusion
Ferrous fumarate’s chemical stability, solubility, and bioavailability make it a valuable iron source. Proper handling and storage are crucial to maintaining its efficacy in pharmaceutical and nutritional applications.