Sodium ferrocyanide
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| Names | |
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IUPAC name
Tetrasodium [hexacyanoferrate(II)]
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| Other names
Yellow prussiate of soda (YPS), Tetrasodium hexacyanoferrate, Gelbnatron, Ferrocyannatrium, sodium hexacyanoferrate(II), Yellow blood salt
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| Identifiers | |
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3D model (Jmol)
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| ECHA InfoCard | 100.033.696 |
| EC Number | 237-081-9 |
| E number | E535 (acidity regulators, ...) |
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PubChem CID
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| Properties | |
| Na4[Fe(CN)6] | |
| Molar mass | 303.91 g/mol |
| Appearance | pale yellow crystals |
| Odor | odorless |
| Density | 1.458 g/cm3 |
| Melting point | 435 °C (815 °F; 708 K) (anhydrous) 81.5 °C (178.7 °F; 354.6 K) (decahydrate) (decomposes) |
| 10.2 g/100 mL (10 °C) 17.6 g/100 mL (20 °C) 39.7 g/100 mL (96.6 °C) |
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Refractive index (nD)
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1.530 |
| Structure | |
| monoclinic | |
| Hazards | |
| S-phrases | S22 S24 S25 |
| Related compounds | |
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Other anions
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Sodium ferricyanide (Red prussiate of soda) |
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Other cations
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Potassium ferrocyanide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| Infobox references | |
Sodium ferrocyanide is the sodium salt of the coordination compound of formula [Fe(CN)6]4−. In its hydrous form, Na4Fe(CN)6·10H2O (sodium ferrocyanide decahydrate), it is sometimes known as yellow prussiate of soda. It is a yellow crystalline solid that is soluble in water and insoluble in alcohol. The yellow color is the color of ferrocyanide anion. Despite the presence of the cyanide ligands, sodium ferrocyanide has low toxicity (acceptable daily intake 0–0.025 mg/kg body weight). The ferrocyanides are less toxic than many salts of cyanide, because they tend not to release free cyanide. However, like all ferrocyanide salt solutions, addition of an acid can result in the production of hydrogen cyanide gas, which is toxic.
Sodium ferrocyanide is a chemical additive known as E 535 in the EU. It is added to road and food grade salt as an anticaking agent. When combined with iron, it converts to a deep blue pigment called Prussian blue. It is used as a stabilizer for the coating on welding rods. In the petroleum industry, it is used for removal of mercaptans.
Sodium ferrocyanide is produced industrially from hydrogen cyanide, ferrous chloride, and calcium hydroxide, the combination of which affords Ca2[Fe(CN)6].11H2O. A solution of this salt is then treated with sodium salts to precipitate the mixed calcium-sodium salt CaNa2[Fe(CN)6], which in turn is treated with sodium carbonate to give the tetrasodium salt.
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