Hydrocyanic acid

Aqueous solution of hydrogen cyanide

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Hydrogen cyanide, an aqueous solution of hydrogen cyanide, is a very weak acid, which is volatile.

Chinese name: Hydrocyanic acid
Foreign name: hydrogen cyanide

chemical formula: HCN（aq）
Appearance: colorless liquid
Essence: Aqueous solution of hydrogen cyanide

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Hydrocyanic acid, an aqueous solution of hydrogen cyanide, is a very weak acid. The commonly used hydrocyanic acid generally contains more than 10% hydrogen cyanide. Ionization constant at 18 ℃ K a =1.3×10 -9 At 25 ℃ K a =6.2×10 -10 。

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Hydrocyanic acid is unstable and easy to decompose:

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