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| ImageSize = 200px | ImageSize = 200px
| IUPACName = Tetrasodium | IUPACName = Tetrasodium
| OtherNames = Yellow prussiate of soda (YPS), Tetrasodium hexacyanoferrate, Gelbnatron, Ferrocyannatrium | OtherNames = Yellow prussiate of soda (YPS), Tetrasodium hexacyanoferrate, Gelbnatron, Ferrocyannatrium, sodium hexacyanoferrate(II)
| Section1 = {{Chembox Identifiers | Section1 = {{Chembox Identifiers
| CASNo = 13601-19-9 | CASNo = 13601-19-9
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}} }}


'''Sodium ferrocyanide''', also known as '''tetrasodium hexacyanoferrate''' or '''sodium hexacyanoferrate(II)''', is a ] of formula Na<sub>4</sub>Fe(CN)<sub>6</sub> that forms semitransparent yellow ]s at ] and decomposes at its boiling point. It is soluble in water and insoluble in ]. Despite the presence of the cyanide ligands, sodium ferrocyanide is not especially toxic (acceptable daily intake 0–0.025&nbsp;mg/(kg body weight)<ref name=toxic/>) because the cyanides are tightly bound to the metal. However, as with all ferrocyanides, it can react with acid or photodecompose to release ] gas. '''Sodium ferrocyanide''' is the sodium salt of the ] of formula <sup>4-</sup>. It is a yellow ]line solid that is soluble in water and insoluble in ]. Despite the presence of the cyanide ligands, sodium ferrocyanide is not especially toxic (acceptable daily intake 0–0.025&nbsp;mg/(kg body weight)<ref name=toxic/>) because the cyanides are tightly bound to the metal. In its ] form, Na<sub>4</sub>Fe(CN)<sub>6</sub>·10H<sub>2</sub>O (sodium ferrocyanide decahydrate), it is sometimes known as yellow prussiate of soda. The yellow color is the color of ] anion.

In its ] form, Na<sub>4</sub>Fe(CN)<sub>6</sub>·10H<sub>2</sub>O (sodium ferrocyanide decahydrate), it is sometimes known as '''yellow prussiate of soda (YP Soda)'''. The yellow color is the color of ] anion.


==Uses== ==Uses==
Sodium ferrocyanide is a chemical additive known as '''E 535'''. It is added to road and food grade ] as an ].<ref name=toxic>{{cite web| url =http://www.inchem.org/documents/jecfa/jecmono/v05je02.htm|title = Toxicological evaluation of some food additives including anticaking agents, antimicrobials, antioxidants, emulsifiers and thickening agents| publisher = World Health Organization, Geneva| year = 1974|accessdate = 18 May 2009}}</ref> When combined with iron, it converts to a deep blue pigment, which is the main component of ].<ref>{{cite web| title = Prussian blue |publisher = Encyclopædia Britannica|accessdate =18 May. 2009 |url =http://www.britannica.com/EBchecked/topic/480982/Prussian-blue}}</ref> In photography, it is used for bleaching, toning, and fixing. It is used as a stabilizer for the coating on ] rods. In the ] industry, it is used for removal of ]s. Sodium ferrocyanide is a chemical additive known as E 535. It is added to road and food grade ] as an ].<ref name=toxic>{{cite web| url =http://www.inchem.org/documents/jecfa/jecmono/v05je02.htm|title = Toxicological evaluation of some food additives including anticaking agents, antimicrobials, antioxidants, emulsifiers and thickening agents| publisher = World Health Organization, Geneva| year = 1974|accessdate = 18 May 2009}}</ref> When combined with iron, it converts to a deep blue pigment called ].<ref>{{cite web| title = Prussian blue |publisher = Encyclopædia Britannica|accessdate =18 May. 2009 |url =http://www.britannica.com/EBchecked/topic/480982/Prussian-blue}}</ref> In photography, it is used for bleaching, toning, and fixing. It is used as a stabilizer for the coating on ] rods. In the ] industry, it is used for removal of ]s.

==Production==
Sodium ferrocyanide is produced industrially from ], ], and ], the combination of which affords Ca<sub>2</sub><sup>.</sup>11H<sub>2</sub>O. A solution of this salt is then treated with sodium salts to precipitate the mixed calcium-sodium salt CaNa<sub>2</sub>, which in turn is treated with sodium carbonate to give the tetrasodium salt.<ref name=Ullmann>E. Gail, S. Gos, Rupprecht Kulzer, J. L örsch, A. Rubo, M. Sauer "Cyano Compounds", Inorganic in Ullmann's Encyclopedia of Industrial Chemistry, 2007, Wiley-VCH, Weinheim. {{DOI|10.1002/14356007.a08 159.pub2}} </ref>


==References== ==References==

Revision as of 14:32, 9 November 2011

Sodium ferrocyanide
Names
IUPAC name Tetrasodium
Other names Yellow prussiate of soda (YPS), Tetrasodium hexacyanoferrate, Gelbnatron, Ferrocyannatrium, sodium hexacyanoferrate(II)
Identifiers
CAS Number
ECHA InfoCard 100.033.696 Edit this at Wikidata
EC Number
  • 237-081-9
E number E535 (acidity regulators, ...)
PubChem CID
CompTox Dashboard (EPA)
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). checkY verify (what is  ?) Infobox references
Chemical compound

Sodium ferrocyanide is the sodium salt of the coordination compound of formula . 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. 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.

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 called 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.

Production

Sodium ferrocyanide is produced industrially from hydrogen cyanide, ferrous chloride, and calcium hydroxide, the combination of which affords Ca211H2O. A solution of this salt is then treated with sodium salts to precipitate the mixed calcium-sodium salt CaNa2, which in turn is treated with sodium carbonate to give the tetrasodium salt.

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)
  4. E. Gail, S. Gos, Rupprecht Kulzer, J. L örsch, A. Rubo, M. Sauer "Cyano Compounds", Inorganic in Ullmann's Encyclopedia of Industrial Chemistry, 2007, Wiley-VCH, Weinheim. doi:10.1002/14356007.a08 159.pub2

http://www.sodium-ferrocyanide.com

Sodium compounds
Inorganic
Halides
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Organic
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