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Hydrogen cyanide

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Identification
Molecular formula
HCN
CAS number
74-90-8
IUPAC name
cyanide
State
State

At room temperature, hydrogen cyanide is typically a gas. This is due to its low boiling point of 25.6°C, which means it can easily evaporate if present as a liquid, transitioning into a gas. The gaseous form is more prevalent in standard atmospheric conditions.

Melting point (Celsius)
-13.20
Melting point (Kelvin)
259.95
Boiling point (Celsius)
25.60
Boiling point (Kelvin)
298.75
General information
Molecular weight
27.03g/mol
Molar mass
27.0250g/mol
Density
0.6876g/cm3
Appearence

Hydrogen cyanide is a colorless or pale blue liquid, which can also occur in a gaseous state at room temperature. Due to its volatility, it has a faint, bitter, almond-like odor, although not all individuals are able to detect this smell. It is notorious for being a highly toxic compound, commonly referenced for its lethal properties.

Comment on solubility

Solubility of Hydrocyanic Acid (HCN)

Hydrocyanic acid, or cyanide, is notable for its unique solubility characteristics. Here are some key points about its solubility:

  • Highly soluble: HCN is *extremely soluble* in water, with a solubility of approximately 0.1 g/mL at room temperature.
  • Polar solvent: Its polar nature allows it to interact effectively with water molecules, leading to its substantial dissolution.
  • Temperature effect: Solubility tends to increase with temperature, following the general trend that solids and gases exhibit in water.
  • Organic solvents: HCN is also soluble in various organic solvents such as ethanol and ether, further highlighting its versatility.

Overall, the high solubility of HCN in water and other solvents means that it can easily become part of various chemical processes, making it an important compound in both chemical synthesis and various industrial applications. However, it's crucial to remember that this compound is highly toxic, and its solubility underscores the need for careful handling and storage.

Interesting facts

Interesting Facts about Cyanide

Cyanide, often recognized by its chemical formula HCN, is a compound that has fascinated and concerned chemists and the public alike due to its potent nature and intriguing applications. Here are some noteworthy aspects of cyanide:

  • Toxicity: Cyanide is one of the most infamous toxins known to science. It can inhibit cellular respiration by binding to cytochrome c oxidase, an essential component of the electron transport chain in mitochondria, leading to a rapid failure of cellular metabolism.
  • Historical Significance: Throughout history, cyanide has been associated with notorious events, including its use in executions and as a poison in warfare. Its quick action makes it particularly lethal.
  • Industrial Uses: Surprisingly, cyanide is not solely a villainous compound. It has crucial applications in various industries, including:
    • Gold mining: Cyanide is used in the extraction of gold from ore through a process called cyanidation.
    • Synthetic chemistry: HCN is utilized in the production of organic compounds, including plastics, dyes, and pharmaceuticals.
  • Natural Occurrence: Cyanide is not just a man-made substance; it occurs naturally in some plants, particularly in seeds of fruits like apples and cherries, in the form of cyanogenic glycosides.
  • Detoxification: The body has mechanisms to detoxify cyanide. One such way is through the conversion into thiocyanate, which is significantly less toxic and is excreted in urine.
  • Safety Measures: Due to its high toxicity, strict regulations and safety measures are relevant when handling cyanide. Workers in industries that use cyanide must follow stringent protocols to prevent accidental exposure.

In summary, while HCN is synonymous with danger, its complex nature leads to vital discussions about its role in both toxicology and industrial chemistry, reminding us that the line between danger and utility can often be thin.

Synonyms
cyanide
CYANIDE ION
Isocyanide
57-12-5
Cyanide anion
Nitrile anion
Carbon nitride ion (CN1-)
OXN4E7L11K
CN-
Cyanide ions
Cyanure [French]
Cyanide(1-) ion
Cyanide(1-)
Cyanides
Cyanure
Cyanide, free
Cyanide (anion)
Cyanide (CN(sup 1-))
RCRA waste number P030
Hydrocyanic acid, ion(1-)-
Carbon nitride ion (CN(sup 1-))
UN1935
RCRA waste no. P030
UNII-OXN4E7L11K
BRN 1900509
iminomethanide
isonitrile
Prussiate
Zyanid
Cyano
MFCD00468042
nitridocarbonate(1-)
Cyanide with potassium salt
CHEMBL186374
DTXSID6023991
BDBM26984
CHEBI:17514
CN(-)
HYDROCYANIC ACID, ION(1-)
CN(-1)
NCGC00188964-01
17B - Total Phenol, Cyanide and Sulfate
NS00001590
C00177
Q185076
Cyanide, Ion chromatography standard solution, Specpure, CN- 1000 microgram/ml
CN?