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Ammonium ferric citrate

physical science Maturity 11-13 Next article →

Ammonium ferric citrate is a special kind of iron compound. It has a chemical formula of C6H9Fe Citrate. This substance is a double salt. It contains iron that is trivalent. Trivalent means the iron has a specific charge. One very important thing is how it mixes with water. It is very soluble in water. This means it dissolves easily. Other types of ferric citrate do not mix as well.

This substance works in a very specific way. It is made of citric acid and ammonium. The citric acid loses four protons in its structure. This is called being deprotonated. The hydroxyl group and two carboxylate groups attach to the iron center. The third carboxylate group connects to the ammonium. This structure helps it dissolve so well. This way it can be used in many different jobs.

People have found many ways to use this iron. It is used as a food ingredient. In food, it has the INS number 381. It acts as an acidity regulator. This helps control how acidic a food is. A famous drink called Irn-Bru uses it. It is also used in the cyanotype photographic process. In that process, it works with potassium ferricyanide to make photos.

Scientists and doctors use it for important tasks. It can help purify water. It acts as a reducing agent for metal salts. This works for metals like gold and silver. Doctors use it as a contrast medium in medical imaging. This helps them see inside the body. It is also used as a hematinic. A hematinic is something that helps the body with blood.

It even helps scientists identify tiny living things. They use a test called Kligler's Iron Agar. This is also known as the KIA test. It helps find enterobacteriaceae bacteria. The test looks at how these bacteria use different sugars. It checks if they produce hydrogen sulfide. This helps scientists know exactly which germs are present. This makes it a very useful tool in a lab.

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