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| Product Name: | cyanic acid | | Synonyms: | cyanic acid;CPD-69;hydrogen cyanate;Cyanic acid (6CI,7CI,8CI,9CI);cyanicaci;EVONIK VESTANAT B1042E;LiquidHydrogencyanate | | CAS: | 420-05-3 | | MF: | CHNO | | MW: | 43.02 | | EINECS: | | | Product Categories: | | | Mol File: | 420-05-3.mol |  |
| | 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) | | pka | 3.7(at 25℃) | | Exposure limits | No exposure limit has yet been set for this compound. | | EPA Substance Registry System | Cyanic acid (420-05-3) |
| | cyanic acid Usage And Synthesis |
| Preparation | Cyanic acid is prepared in the laboratory by dry distillation of cyanuric acid, C3N3(OH)3.
| | Reaction | Cyanic 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 Properties | Colorless 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. | | Uses | Hydrogen cyanate is used in the preparation of cyanates. | | Uses | In formation of some cyanates. | | Definition | cyanic 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 Hazard | Hydrogen 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 Hazard | Flammable; the liquid can explode when heated rapidly. | | Waste Disposal | Hydrogen cyanate can be disposed of in the drain in small amounts. It decomposes in water forming CO2 and NH3. |
| | cyanic acid Preparation Products And Raw materials |
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