Sodium ferrocyanide

Sodium ferrocyanide is the sodium salt of the coordination compound of formula [Fe(CN)₆]^4-. It is a yellow crystalline solid that is soluble in water and insoluble in alcohol. Despite the presence of the cyanide ligands, sodium ferrocyanide is not especially toxic (acceptable daily intake 0–0.025 mg/kg body weight) because the cyanides are tightly bound to the metal. However, like all ferrocyanide salt solutions, addition of an acid (a hydrogen donor) can result in the production of cyanide gas (HCN), which is toxic. In its hydrous form, Na₄Fe(CN)₆·10H₂O (sodium ferrocyanide decahydrate), it is sometimes known as yellow prussiate of soda. The yellow color is the color of ferrocyanide anion.

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