Sodium ferrocyanide

Sodium ferrocyanide[1]
IUPAC name Tetrasodium [hexacyanoferrate(II)]
Other names Yellow prussiate of soda (YPS), Tetrasodium hexacyanoferrate, Gelbnatron, Ferrocyannatrium, sodium hexacyanoferrate(II)
Identifiers
CAS number	13601-19-9
PubChem	26129
EC number	237-081-9
Properties
Molecular formula	Na4Fe(CN)6
Molar mass	303.91 g/mol
Appearance	Yellow crystals
Density	1.458 g/cm3
Melting point	435 °C (decomposes)
Solubility in water	18 g/100 mL
Structure
Crystal structure	monoclinic
Hazards
S-phrases	S22 S24 S25
Related compounds
Other anions	Sodium ferricyanide (Red prussiate of soda)
Y ferrocyanide (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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)^[2]) 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.^[2] When combined with iron, it converts to a deep blue pigment called Prussian blue.^[3] 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 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.^[4]

References

1. ^ Sodium ferrocyanide MSDS
2. ^ ^{a b} "Toxicological evaluation of some food additives including anticaking agents, antimicrobials, antioxidants, emulsifiers and thickening agents". World Health Organization, Geneva. 1974. http://www.inchem.org/documents/jecfa/jecmono/v05je02.htm. Retrieved 18 May 2009. 
3. ^ "Prussian blue". Encyclopædia Britannica. http://www.britannica.com/EBchecked/topic/480982/Prussian-blue. Retrieved 18 May. 2009. 
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

This Toxicology-related article is a stub. You can help Wikipedia by expanding it.v · Categories: Toxicology stubs Sodium compounds Cyanides Wikimedia Foundation. 2010. Игры ⚽ Поможем написать реферат Green-Meldrim House The Dying Daylights Look at other dictionaries: sodium ferrocyanide — noun : a yellow crystalline salt Na4Fe(CN)6 similar to potassium ferrocyanide and used in making iron blue pigments, blueprint paper, and dyes called also yellow prussiate of soda …   Useful english dictionary sodium nitroprusside — noun : a red crystalline salt Na2[Fe(CN)5NO].2H2O made usually by reaction of a ferrocyanide and nitric acid or of a ferricyanide and nitrous acid and used chiefly in testing for sulfides with which it forms a violet color in alkaline solution;… …   Useful english dictionary yellow prussiate of soda — sodium ferrocyanide …   Useful english dictionary E535 — Sodium ferrocyanide (Miscellaneous » Food) …   Abbreviations dictionary Список пищевых добавок E500-E599 — E500 E599 Пищевые добавки. Группа Регуляторы pH и вещества против слёживания . Индекс Название вещества Английское название E500 Карбонаты натрия: (i) Карбонат натрия (ii) Гидрокарбонат натрия (iii) Смесь карбоната и гидрокарбоната натрия …   Википедия Список пищевых добавок E500 — Эта статья или раздел описывает ситуацию применительно лишь к одному региону. Вы можете помочь Википедии, добавив информацию для других стран и регионов. E500 E599 Пищевые до …   Википедия Cyanide — This article is about the class of chemical compounds. For other uses, see Cyanide (disambiguation). The cyanide ion, CN−. From the top: 1. Valence bond structure 2. Space filling model 3. Electrostatic potential surface 4. Carbon lone pair… …   Wikipedia E number — This article is about the food additive codes. For other uses, see E number (disambiguation). E numbers are number codes for food additives that have been assessed for use within the European Union (the E prefix stands for Europe ).[1] They are… …   Wikipedia Anticaking agent — Anticaking agents are used in such things as table salt to keep the product from forming lumps, making it better for packaging, transport, and for the consumer. An anticaking agent in salt is denoted in the ingredients for example as anti caking… …   Wikipedia List of food additives — This is an alphabetical list of food additives. For related lists, see also: List of food additives, Codex Alimentarius and E number.: This article is incomplete. Please help by expanding it. List of food additive types* Acidity regulators * Anti …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”