Use of Ammonium ferric citrate

 Ammonium Ferric Citrate is a compound with the formula (NH4)5[Fe(C6H4O7)2] has a distinguishing feature which is that it is too much soluble in water whereas ferric citrate is less soluble in water.

Each moiety of citric acid with its Crystal structure has lost four protons. The deprotonated hydroxyl group & 2 of the carboxylate groups ligate to the ferric center, while the 3rd carboxylate group coordinates with the ammonium.

 

Use of Ammonium ferric citrate

·         Ammonium ferric citrate is used as a food ingredient. It has INS number & is used as an acidity regulator. Widely used in the Scottish beverage aka Irn-Bru.

·         Also used for purifying water.

·         Ammonium ferric citrate is used as a reducing agent of metal salts of low activity like silver & gold.

·         Also used with potassium ferricyanide, part of the photographic process (cyanotype)

·         It is used as a contrast medium in medical imaging.

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