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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⁺) bound to fumarate anions, forming a reddish-brown or orange-brown 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 may oxidize to ferric (Fe³⁺) compounds when exposed to moisture and air. It decomposes at high temperatures (above 280°C) without melting. The compound is insoluble in ethanol but dissolves in dilute mineral acids, enhancing its absorption in the gastrointestinal tract.

pH Sensitivity
Its solubility increases in acidic media (pH < 3), which is why it is often combined with vitamin C or other acidifiers in supplements to improve iron absorption. In neutral or alkaline conditions, ferrous fumarate precipitates, reducing bioavailability. Applications in Industry Due to its high iron content (about 33% elemental iron) and low toxicity, ferrous fumarate is a preferred ingredient in: - Pharmaceuticals: Treats iron-deficiency anemia. - Food Fortification: Added to cereals and flour. - Animal Feed: Enhances iron levels in livestock. Conclusion Ferrous fumarate’s unique chemical properties—moderate solubility, pH-dependent stability, and high iron content—make it a valuable compound in healthcare and nutrition. Proper storage in airtight, moisture-free containers ensures its efficacy in industrial applications.