Thiocyanic acid
Names | |
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IUPAC name
Thiocyanic acid[4]
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Other names | |
Identifiers | |
3D model (
JSmol ) |
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3DMet | |
ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard
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100.006.672 |
EC Number |
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25178 | |
KEGG | |
MeSH | thiocyanic+acid |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
HSCN | |
Molar mass | 59.09 g·mol−1 |
Appearance | |
Odor | Pungent |
Density | 2.04 g/cm3 |
Melting point | |
Miscible | |
Solubility | Soluble in ethanol, diethyl ether |
log P | 0.429 |
Vapor pressure | 4.73 mmHg (631 Pa)[7] |
Acidity (pKa) | 0.926 |
Basicity (pKb) | 13.071 |
Hazards | |
GHS labelling: | |
Warning | |
H302, H312, H332, H412 | |
P261, P264, P270, P271, P273, P280, P301+P312, P302+P352, P304+P312, P304+P340, P312, P322, P330, P363, P501 | |
Related compounds | |
Related compounds
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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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Thiocyanic acid is a
vapor phase.[9]
It is a moderately
pKa of 1.1 at 20 °C and extrapolated to zero ionic strength.[11]
One of the thiocyanic acid tautomers, HSCN, is predicted to have a triple bond between carbon and nitrogen. Thiocyanic acid has been observed spectroscopically.[12]
The
organyl
group.
Isothiocyanic acid, HNCS, is a Lewis acid whose free energy, enthalpy and entropy changes for its 1:1 association with a variety of Lewis bases in carbon tetrachloride solution at 25 °C have been reported.organyl group.
Wikimedia Commons has media related to Thiocyanic acid.
References
- ^ Merck Index, 11th Edition, 9257.
- ^ The Merck Index. Royal Society of Chemistry.
- ^ von Richter, Victor (1922). Organic Chemistry or Chemistry of the Carbon Compounds. Vol. 1. Translated by Spielmann, Percy E. Philadelphia: P. Blakiston's Son & Co. p. 466.
- ^ "Thiocyanic acid" entry in PubChem (database).
- ^
- CAS Common Chemistry.
- ^ Brown, Jay A. (ed.; 2024), "Thiocyanic Acid" in Haz-Map (database). Engineered IT.
- ISBN 0-12-352651-5.
- hdl:1721.1/4934.
- ^ Munegumi, Toratane (23 January 2013). "Where is the Border Line between Strong Acids and Weak Acids?". World Journal of Chemical Education. 1 (1): 12–16.
- ^ Martell, A. E.; Smith, R. M.; Motelaitis, R. J. (2001). NIST Database 46. Gaithersburg, MD: National Institute of Standards and Technology.
- .
- ^ . Barakat, T. M.; Nelson, J.; Nelson, S. M.; Pullin, A. D. E. (1969.) “Spectra and hydrogen-bonding of characteristics of thiocyanic acid. Part 4.—Association with weak proton acceptors”. Trans. Faraday Soc., 1969,65, 41-51