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.

Raw materials

Preparation Products