cyanic acid

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Products Intro: CAS:420-05-3
cyanic acid Basic information
Preparation Reaction
Product Name:cyanic acid
Synonyms:cyanic acid;CPD-69;hydrogen cyanate;Cyanic acid (6CI,7CI,8CI,9CI);cyanicaci
CAS:420-05-3
MF:CHNO
MW:43.02
EINECS:
Product Categories:
Mol File:420-05-3.mol
cyanic acid Structure
cyanic acid Chemical Properties
Melting point -86°
Boiling point bp760 23.5°
density d420 1.140; d4-20 1.156
refractive index 1.4300 (estimate)
pka3.7(at 25℃)
Exposure limitsNo exposure limit has yet been set for this compound.
EPA Substance Registry SystemCyanic acid (420-05-3)
Safety Information
MSDS Information
cyanic acid Usage And Synthesis
PreparationCyanic acid is prepared in the laboratory by dry distillation of cyanuric acid, C3N3(OH)3.
ReactionCyanic acid decomposes on heating. Rapid heating may cause explosion. When heated to high temperatures, it decomposes forming carbon dioxide, water, and nitrogen oxides:
4NCOH + 7O2 4CO2 + 4NO2 + 2H2O
It dissolves in water decomposing to carbon dioxide and ammonia. Although the reaction occurs at ordinary temperatures, it is slow in dilute aqueous solutions at ice temperature.
NCOH + H2O → CO2 + NH3
The compound polymerizes on standing, forming cyanuric acid, an oxygen heterocylic compound, 1,3,5-trioxane-2,4,6-triimine, C3H3N3O3.
Chemical PropertiesColorless liquid or gas with an acrid smell; mp -86°C (-122.8°F); bp 23.5°C (74.3°F); density 1.140 at 20°C (68°F); soluble in water, alcohol, ether, benzene, and toluene.
UsesIn formation of some cyanates.
UsesHydrogen cyanate is used in the preparation of cyanates.
Definitioncyanic acid: An unstable explosiveacid, HOCN. The compound has thestructure H–O–C≡N, and is also calledfulminic acid. Its salts and esters arecyanates (or fulminates). The compoundis a volatile liquid, whichreadily polymerizes. In water it hydrolysesto ammonia and carbondioxide. It is isomeric with anotheracid, H–N=C=O, which is known asisocyanic acid. Its salts and esters areisocyanates.
Health HazardHydrogen cyanate is a severe irritant to the eyes, skin, and mucous membranes. Exposure to this compound can cause severe lacrimation. Inhalation can produce irritation and injury to the respiratory tract. LD50 values are not reported.
Fire HazardFlammable; the liquid can explode when heated rapidly.
Waste DisposalHydrogen cyanate can be disposed of in the drain in small amounts. It decomposes in water forming CO2 and NH3.
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