Discuss subjective determination of acid strength. Introduce a objective, mathematical approach based on acid ionization. Write a general formula to indicate the ionization of acid HX into H+ ions and X- ions. Present the ionization formula determination for an acid as Ka. Ka = product of the concentration of products/product of the concentration of reactants. ( ) is read as the product of whatever is inside. (H+) is the concentration of hydrogen ions. Example with HF. Ka = (H+) (F-) l/ (HF). (water) remains constant. From a chart of Ka and the given Ka for hydrofluoric acid and acetic acid, determine which is stronger and why