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Sodium ferrocyanide

Names
IUPAC name Tetrasodium
Other names Yellow prussiate of soda (YPS), Tetrasodium hexacyanoferrate, Gelbnatron, Ferrocyannatrium
Identifiers
CAS Number	13601-19-9
ECHA InfoCard	100.033.696
EC Number	237-081-9
E number	E535 (acidity regulators, ...)
PubChem CID	26129
CompTox Dashboard (EPA)	DTXSID3051337
Properties
Chemical formula	Na4Fe(CN)6
Molar mass	303.91 g/mol
Appearance	Yellow crystals
Density	1.458 g/cm
Melting point	435 °C (decomposes)
Solubility in water	18 g/100 mL
Structure
Crystal structure	monoclinic
Related compounds
Other anions	Sodium ferricyanide (Red prussiate of soda)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Sodium ferrocyanide, also known as tetrasodium hexacyanoferrate or sodium hexacyanoferrate(II), is a coordination compound of formula Na₄Fe(CN)₆ that forms semitransparent yellow crystals at room temperature and decomposes at its boiling point. It 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, as with all ferrocyanides, it can react with acid or photodecompose to release hydrogen cyanide gas.

In its hydrous form, Na₄Fe(CN)₆·10H₂O (sodium ferrocyanide decahydrate), it is sometimes known as yellow prussiate of soda (YP Soda). The yellow color is the color of ferrocyanide anion.

Uses

Sodium ferrocyanide is a chemical additive known as E 535. It is added to road and food grade salt as an anticaking agent. When combined with iron, it converts to a deep blue pigment, which is the main component of Prussian blue. In photography, it is used for bleaching, toning, and fixing. It is used as a stabilizer for the coating on welding rods. In the petroleum industry, it is used for removal of mercaptans.

References

1. Sodium ferrocyanide MSDS
2. ^ "Toxicological evaluation of some food additives including anticaking agents, antimicrobials, antioxidants, emulsifiers and thickening agents". World Health Organization, Geneva. 1974. Retrieved 18 May 2009.
3. "Prussian blue". Encyclopædia Britannica. Retrieved 18 May. 2009. {{cite web}}: Check date values in: |accessdate= (help)

http://www.sodium-ferrocyanide.com

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