is hcn a strong base?
HCN, also known as hydrocyanic acid or prussic acid, is a weak acid. ... According to this source , the of HCN is , which is really tiny. Memorize the short list of acids that are typically thought of as strong. This includes HCl, HBr, HI, HNO3, HClO3, HClO4, and H2SO4.