5. Hydrogen cyanide has the chemical formula HCN. The compound occurs as a colourless gas or a pale blueliquid. Its solution in water is called hydrocyanic acid. It reacts with water as per the reaction. What is the pH ofa 0.30 mol/L solution of the above acid (Ka=6.2 x 10-10)? HCN(aq) + H20(1) – CN-(aq) + H30+(aq)… Show more Science Chemistry SCIENCE N/A Share QuestionEmailCopy link Comments (0)