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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 (Fe²⁺) ions 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 formulations.

Stability and Reactivity
Ferrous fumarate is stable under dry conditions but can oxidize in moist environments, converting to ferric (Fe³⁺) compounds. It decomposes at high temperatures (around 280°C) without melting. The compound is slightly acidic (pH ~5-6 in solution) and reacts with strong oxidizing agents, requiring careful storage in airtight containers away from light and moisture.

Applications in Industry
Due to its high iron content (~33%) and low gastrointestinal irritation, ferrous fumarate is a preferred ingredient in iron supplements and fortified foods. Its stability ensures prolonged shelf life in tablets and capsules. Additionally, it is used in animal feed to prevent iron deficiency.

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In summary, ferrous fumarate’s unique chemical properties, including stability, bioavailability, and low reactivity, make it a valuable compound in healthcare and nutrition. Proper handling ensures its effectiveness in pharmaceutical and food applications.