Write the dissociation reaction and the corresponding ka equilibrium expression for hcn in water

Chemical reaction: HCN (aq) + H₂O (l) ⇄ CN⁻ (aq) + H₃O⁺ (aq).

Ka = [CN⁻] · [H₃O⁺] / [HCN].

[HCN] is equilibrium concentration of hydrocyanic acid.

hydrocyanic acid is weakly acidic and partially ionizes in water solution and give the cyanide anion (CN⁻).

The salts of the cyanide anion are called cyanides.