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Thiocyanic acid

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Identification
Molecular formula
HSCN
CAS number
463-56-9
IUPAC name
thiocyanic acid
State
State

At room temperature, thiocyanic acid exists as a volatile liquid. It is known for its readiness to form salts and esters rather than remaining in its pure state.

Melting point (Celsius)
-6.00
Melting point (Kelvin)
267.00
Boiling point (Celsius)
82.00
Boiling point (Kelvin)
355.00
General information
Molecular weight
59.08g/mol
Molar mass
59.0820g/mol
Density
0.9674g/cm3
Appearence

Thiocyanic acid is a colorless and volatile liquid. Due to its instability, it is rarely encountered in its pure form and is known to fume in moist air, emitting a weak acidic odor.

Comment on solubility

Solubility of Thiocyanic Acid (HSCN)

Thiocyanic acid, or HSCN, exhibits interesting solubility properties that are noteworthy for both academic and practical applications. When it comes to solubility, consider the following points:

  • Solvent Compatibility: HSCN is highly soluble in polar solvents, particularly water. This characteristic is primarily due to its molecular structure, which allows for effective hydrogen bonding with water molecules.
  • Temperature Dependence: The solubility of thiocyanic acid can vary with temperature. Generally, as the temperature increases, the solubility of HSCN in water also increases, making it easier to dissolve in warmer conditions.
  • Ionization Consideration: In aqueous solution, thiocyanic acid partially ionizes to form thiocyanate ions (SCN) and hydrogen ions (+ H). This ionization enhances its ability to interact with other solutes, which can contribute to its overall solubility in various environments.
  • Concentration Limits: While HSCN is soluble in water, there are limits to how much can dissolve at a given temperature before reaching saturation. Understanding these limits is crucial for practical applications in chemistry.

In summary, thiocyanic acid (HSCN) is a polar and soluble compound in water, influenced by temperature and its capacity to ionize.

Interesting facts

Interesting Facts about Thiocyanic Acid

Thiocyanic acid, also known as mercaptan carbonic acid or thiocyanoic acid, is a fascinating compound that plays an important role in various chemical processes. Here are some intriguing aspects of this compound:

  • Chemical Structure: Thiocyanic acid consists of a sulfur atom bonded to a carbon atom, which in turn is bonded to a nitrogen atom. This unique arrangement gives the molecule its characteristic properties.
  • Reactivity: Due to the presence of both sulfur and nitrogen, thiocyanic acid is an interesting player in organic reactions. It can act as a weak acid and can participate in nucleophilic reactions, which involve the donation of an electron pair.
  • Role in Biochemistry: Thiocyanic acid has been noted for its presence in the human body. It is derived from the metabolism of various compounds and may have implications in thyroid function as well as in the synthesis of other biological molecules.
  • Applications: In the laboratory, thiocyanic acid can be used in the synthesis of various organic compounds, making it a valuable reagent in organic chemistry. It is especially potent in creating thiocyanates, which have broader applications in agrochemicals and pharmaceuticals.
  • Taste and Odor: Interestingly, thiocyanic acid itself has a strong and often unpleasant odor. In comparison, its salts (like potassium thiocyanate) are known to exhibit less pronounced smells.
  • Environmental Impact: Thiocyanic acid can be found in certain situations as a contaminant, especially in industries dealing with sulfur compounds. It's essential for scientists to monitor its levels due to potential toxicity.

In summary, thiocyanic acid is not only a key compound in various chemical reactions but also presents rich opportunities for further research in biochemical pathways and industrial applications. The study of compounds like thiocyanic acid exemplifies how diverse and multifaceted chemistry can be!

Synonyms
thiocyanic acid
463-56-9
Sulfocyanic acid
HSCN
CHEBI:29200
UNII-A5KWW7N91V
A5KWW7N91V
[CN(SH)]
[C(N)(SH)]
EINECS 207-337-4
nitridosulfanidocarbon
HS-C#N
N#C-SH
THIOCYANIC ACID [MI]
DTXSID7047221
Ammonium rhodanate
(CN(SH))
Thiocyansaeure
(C(N)(SH))
sulfonium cyanide
hydrogen rhodanide
Rhodanwasserstoffsaure
SCN
CHEMBL84336
Rhodanwasserstoffsaure (German)
DTXCID5027221
DTXSID90166649
BDBM50499190
nitridosulfanidocarbon;thiocyanic acid
AKOS006227906
BP-21171
NS00002251
C01755
Q25792
Q27110065
207-337-4