Sodium cyanide
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| Identifiers | |||
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143-33-9  |
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| ChEMBL | ChEMBL1644697  |
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| ChemSpider | 8587 |
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| EC Number | 205-599-4 | ||
| Jmol 3D model | Interactive image | ||
| PubChem | 8929 | ||
| RTECS number | VZ7525000 | ||
| UN number | 1689 | ||
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| Properties | |||
| NaCN | |||
| Molar mass | 49.0072 g/mol | ||
| Appearance | white solid | ||
| Odor | faint almond-like | ||
| Density | 1.5955 g/cm3 | ||
| Melting point | 563.7 °C (1,046.7 °F; 836.9 K) | ||
| Boiling point | 1,496 °C (2,725 °F; 1,769 K) | ||
| 48.15 g/100 mL (10 °C) 63.7 g/100 mL (25 °C) |
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| Solubility | soluble in ammonia, methanol, ethanol very slightly soluble in dimethylformamide, SO2 insoluble in dimethylsulphoxide |
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Refractive index (nD)
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1.452 | ||
| Thermochemistry | |||
| 70.4 J/mol K | |||
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Std molar
entropy (S |
115.7 J/mol K | ||
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Std enthalpy of
formation (ΔfH |
-91 kJ/mol | ||
| Vapor pressure | {{{value}}} | ||
| Related compounds | |||
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Other cations
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Potassium cyanide | ||
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Related compounds
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Hydrogen cyanide | ||
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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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 verify (what is ?) |
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| Infobox references | |||
Sodium cyanide is an inorganic compound with the formula NaCN. It is a white, water-soluble solid. Cyanide has a high affinity for metals, which leads to the high toxicity of this salt. Its main application, in gold mining, also exploits its high reactivity toward metals. When it is treated with acid, it forms the toxic gas hydrogen cyanide:
- NaCN + H2SO4 → HCN + NaHSO4
Contents
Production and chemical properties
Sodium cyanide is produced by treating hydrogen cyanide with sodium hydroxide:[2]
- HCN + NaOH → NaCN + H2O
Worldwide production was estimated at 500,000 tons in the year 2006. Formerly it was prepared by the Castner-Kellner process involving the reaction of sodium amide with carbon at elevated temperatures.
- NaNH2 + C → NaCN + H2
The structure of solid NaCN is related to that of sodium chloride.[3] The anions and cations are each six-coordinate. Potassium cyanide (KCN) adopts a similar structure. Each Na+ forms pi-bonds to two CN− groups as well as two "bent" Na---CN and two "bent" Na---NC links.[4]
Because the salt is derived from a weak acid, NaCN readily reverts to HCN by hydrolysis: the moist solid emits small amounts of hydrogen cyanide, which smells like bitter almonds (not everyone can smell it—the ability thereof is due to a genetic trait[5]). Sodium cyanide reacts rapidly with strong acids to release hydrogen cyanide. This dangerous process represents a significant risk associated with cyanide salts. It is detoxified most efficiently with hydrogen peroxide (H2O2) to produce sodium cyanate (NaOCN) and water:[2]
- NaCN + H2O2 → NaOCN + H2O
Applications
Cyanide mining
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Sodium gold cyanide
Sodium cyanide is used mainly to extract gold and other precious metals in mining industry. This application exploits the high affinity of gold(I) for cyanide, which induces gold metal to oxidize and dissolve in the presence of air and water, producing the salt sodium gold cyanide (or gold sodium cyanide) and sodium hydroxide:
- 4 Au + 8 NaCN + O2 + 2 H2O → 4 Na[Au(CN)2] + 4 NaOH
A similar process uses potassium cyanide (KCN, a close relative of sodium cyanide) to produce potassium gold cyanide (KAu(CN)2). Few other methods exist for this extraction process.
Chemical feedstock
Several commercially significant chemical compounds are derived from cyanide, including cyanuric chloride, cyanogen chloride, and many nitriles. In organic synthesis, cyanide, which is classified as a strong nucleophile, is used to prepare nitriles, which occur widely in many specialty chemicals, including pharmaceuticals.
Niche uses
Being highly toxic, sodium cyanide is used to kill or stun rapidly such as in widely illegal cyanide fishing and in collecting jars used by entomologists.
Toxicity
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Sodium cyanide, like other soluble cyanide salts, is among the most rapidly acting of all known poisons. NaCN is a potent inhibitor of respiration, acting on mitochondrial cytochrome oxidase and hence blocking electron transport. This results in decreased oxidative metabolism and oxygen utilization. Lactic acidosis then occurs as a consequence of anaerobic metabolism. An oral dosage as small as 200-300 mg can be fatal.
See also
References
- ↑ http://cameochemicals.noaa.gov/chemical/4477
- ↑ 2.0 2.1 Andreas Rubo, Raf Kellens, Jay Reddy, Norbert Steier, Wolfgang Hasenpusch "Alkali Metal Cyanides" in Ullmann's Encyclopedia of Industrial Chemistry 2006 Wiley-VCH, Weinheim, Germany. doi:10.1002/14356007.i01_i01
- ↑ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Online 'Mendelian Inheritance in Man' (OMIM) 304300
External links
- Institut national de recherche et de sécurité (INRS), "Cyanure de sodium. Cyanure de potassium", Fiche toxicologique n° 111, Paris, 2006, 6 pp. (PDF file, in French)
- International Chemical Safety Card 1118
- Hydrogen cyanide and cyanides (CICAD 61)
- National Pollutant Inventory - Cyanide compounds fact sheet
- NIOSH Pocket Guide to Chemical Hazards
- EINECS number 205-599-4
- CID 8929 from PubChem
- CSST (Canada)
- Sodium cyanide hazards to fish and other wildlife from gold
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