Question: how does hcn dissociate in water?
Answer: Hydrocyanic acid (HCN) is a weak acid that dissociates in water as follows. HCN(aq) + H2O(l) equilibrium reaction arrow H3O+(aq) + CN −(aq) The acid-dissociation constant (Ka) for hydrocyanic acid is 6.2 ✕ 10−10.