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Cyanic acid is a colourless poisonous liquid with a boiling point of 23.5°C and a melting point of -81°C. At 0°C cyanic acid is converted to cyamelide. In water, cyanic acid hydrolyses to carbon dioxide and ammonia. Cyanic acid (H-N=C=O) is an isomer of fulminic acid (H-C=N-O). Two tautomers exist for cyanic acid, NC-O-H and H-N=C=O . It forms in a reaction between potassium cyanate and formic acid. The trimer of cyanic acid is cyanuric acid.
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