Althоugh it is pоisоnous, the cyаnide аnion is аctually used in chemical reactions, including the synthesis of some drugs. You can make a cyanide anion by doing a Bronsted acid/base reaction with hydrogen cyanide. Such a reaction is shown below, where the hydrogen cyanide is Bronsted acid and the dihydrogen phosphate anion is the Bronsted base to form phosphoric acid and the cyanide anion.. Based on the provided pKa values, is this reaction favorable, can you use a dihydrogen phosphate anion to convert hydrogen cyanide into a cyanide anion?